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Something the thickness of electrical tape…

SuzukiGS750EZ

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Trying to protect two pieces of anodized aluminum from rubbing on each other. I can fit a piece of electrical tape between the two pieces but that’s as thick as tolerances will allow. Does anybody have any suggestions as to what would work for longevity?
 
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mike93lx

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A piece of hdpe or uhmw.

If it isn't a lot of friction, hdpe might do it, which you can cut from a milk jug or buy sheets pretty cheaply. 1/16" would match electrical tape pretty well, I think
 

darkzero

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How about Tesa tape, the one that's more abrasion resistant. Not sure what it's actually called, we call it exterior Tesa tape, the fuzzy one we call interior Tesa tape.

Or maybe gaffers tape? It somewhat similar in appearance to the Tesa exterior tape but might be a bit thicker than the Tesa.
 

wyb2

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Delrin (aka acetal aka POM), PTFE, (aka Teflon), or UHMWPE (aka … something?) are usually recommended for low friction and wear resistance. Not sure about tapes, but they are all probably available in shim form.
 
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SuzukiGS750EZ

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So for anybody curious, and I’m hesitant to post about firearms on here. It’s for a Benelli M4 m lok heat shield. There is an optic mount on the top of the receiver with a square hole in the front of it that the heat shield interfaces with. However, there is some play due to machining tolerance and the only thing I was able to find that would stop it perfectly was some 3M electrical tape. So I only need it on one side of the male part of the heat shield, but I’d like something long term I don’t need to constantly replace as I take the gun down or shoot it.
 

56Willys

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Kapton tape. It's thinner than electrical tape but you could use multiple layers. Heat resistant and very tough. It's used in electronics for insulation and masking for soldering.
 

Firebrick43

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So for anybody curious, and I’m hesitant to post about firearms on here. It’s for a Benelli M4 m lok heat shield. There is an optic mount on the top of the receiver with a square hole in the front of it that the heat shield interfaces with. However, there is some play due to machining tolerance and the only thing I was able to find that would stop it perfectly was some 3M electrical tape. So I only need it on one side of the male part of the heat shield, but I’d like something long term I don’t need to constantly replace as I take the gun down or shoot it.
Stainless steel shim stock. You can get it in many thicknesses. Buy it in sheet or precut 1/2” wide rolls

Measure how many thousands thick is your

Starrett 667-7
 

Beerhippie

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So for anybody curious, and I’m hesitant to post about firearms on here. It’s for a Benelli M4 m lok heat shield. There is an optic mount on the top of the receiver with a square hole in the front of it that the heat shield interfaces with. However, there is some play due to machining tolerance and the only thing I was able to find that would stop it perfectly was some 3M electrical tape. So I only need it on one side of the male part of the heat shield, but I’d like something long term I don’t need to constantly replace as I take the gun down or shoot it.
For simple shim material, aluminum beer cans are hard to beat. They used to be 0.010", but the newer ones we use are 0.005". Once you've removed the ends, the material cuts easily with scissors.

For a permanent fix, epoxy. I've used it to tighten the upper-to-lower fit in my AR. The trick is to use a mold release on one part so you don't end up with a one-piece gun.
 
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SuzukiGS750EZ

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Kapton tape. It's thinner than electrical tape but you could use multiple layers. Heat resistant and very tough. It's used in electronics for insulation and masking for soldering.
Is this the yellowish tape? If so I have a bunch at my work. Looks like cellophane
 
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SuzukiGS750EZ

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Assuming this is a genuine Benelli, I'd contact the manufacturer of the heatshield.
I did. He says that there has to be machining tolerance due to variation across manufacturing. Each one does the same. It’s made for tool less take down versus the one I had previous where I’d have to disassemble the darn thing.
 

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Rabid Badger

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I did. He says that there has to be machining tolerance due to variation across manufacturing. Each one does the same. It’s made for tool less take down versus the one I had previous where I’d have to disassemble the darn thing.
How often are you disassembling this gun? Can you post pictures of what you're trying to shim?
 
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SuzukiGS750EZ

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How often are you disassembling this gun? Can you post pictures of what you're trying to shim?
It’s not so much taking it down as it is just the constant rubbing while I’m shooting. I need something between .17 and .19mm thick. I found some 3M 9731 tape at work I’m going to try but unsure how adhesive it will be. I’m more worried about adhesion than anything. I think once the space is taken up almost anything will work. A bonus would be wear resistance lol
 

Dave455

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How about some “speed tape”?

The proper aerospace stuff would probably be best, it’s really sticky, but alternatively just some aluminium ducting tape?

IMG_1465.jpeg
 

FigN⋅m

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Watched a vid on assembly and read the RxArms release thread, and if I was determined to take out the
wee bit of slop, I would try a film of JB Weld on the heatshield tab and slowly file it to make a tighter fit.
Alternatively, I would gently try to peen the tab to raise the material slightly to push against the optic rail.

Even the mfr's. suggestion of a Ranger Band seems like a viable solution, (but I would understand your reluctance.)
I wouldn't be too concerned about making certain parts a press fit, fighting guns usually have a little rattle to 'em... ;)
 
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SuzukiGS750EZ

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Watched a vid on assembly and read the RxArms release thread, and if I was determined to take out the
wee bit of slop, I would try a film of JB Weld on the heatshield tab and slowly file it to make a tighter fit.
Alternatively, I would gently try to peen the tab to raise the material slightly to push against the optic rail.

Even the mfr's. suggestion of a Ranger Band seems like a viable solution, (but I would understand your reluctance.)
I wouldn't be too concerned about making certain parts a press fit, fighting guns usually have a little rattle to 'em... ;)
lol yeah I don’t mind a rattle. The gas pistons rattle a bit. Same with the anodizing on the receiver. It was when having a thumb over bore grip that it would shift on me and just didn’t feel right. I thought about JB weld as well and may do that down the road. It would check every box necessary. However my epoxy work leaves a lot to be desired 😂
 

PCustoms

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How much movement is there?

Dab of form a gasket?

Should smear down to fill the gap and can provide a little movement. If you need more movement grease on half first so it can't stick

Available in black.
 

autobon7

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It’s not so much taking it down as it is just the constant rubbing while I’m shooting. I need something between .17 and .19mm thick. I found some 3M 9731 tape at work I’m going to try but unsure how adhesive it will be. I’m more worried about adhesion than anything. I think once the space is taken up almost anything will work. A bonus would be wear resistance lol
Nylatron is what you need. Would be perfect for your application.

Nylatron is a brand of engineering plastic, specifically a type of nylon, known for its high strength, wear resistance, and ability to handle high loads and pressures. It's often used in bearing and wear applications due to its low coefficient of friction and self-lubricating properties
 
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rlitman

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Very Thin copper roof flashing?

Or something like this?

One of the privileges of having a jewelers rolling mill is I can feed in any sorts of metal and roll it down to whatever thickness suits my needs. I've even managed to roll down stainless shim stock (but only by a VERY small amount). I can stretch a penny almost a foot.
 

Beerhippie

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lol yeah I don’t mind a rattle. The gas pistons rattle a bit. Same with the anodizing on the receiver. It was when having a thumb over bore grip that it would shift on me and just didn’t feel right. I thought about JB weld as well and may do that down the road. It would check every box necessary. However my epoxy work leaves a lot to be desired 😂
Use masking tape to mask off the area you want to build up. Use some coarse sandpaper to roughen the surface you want the epoxy to stick to and clean it with acetone. Work the epoxy with a toothpick or similar to ensure good contact with the metal. There's an intermediate phase in the setting of epoxy where it's soft enough to work with a knife, but no longer sticky--keeping it cold will prolong this period. Remove the masking at this point. Get it roughly the shape you want, then either let it sit or heat-cure at 225F and finish with some small files.

Alternatively, apply a mold release to the other part, apply the epoxy, assemble and let the epoxy set in place. Epoxy doesn't shrink while setting, so this can work very well, especially if you put the other piece on after the epoxy has begun to gel.

Epoxy will hold paint well if you want to blend it in.

I've used JB Weld to bed actions and even to take up slop in trigger mechanisms (go to the Ruger section of Rimfire Central and search for "JB Weld trick"). It's easy to do and a permanent solution if applied correctly.
 
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RTM

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Gun ignorant question: what about PEEK sheet? Available in 1 mm increments on ebay. Supposedly good to 250⁰C

50x50x5 mm is under $6
 

iflyatiger

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I tried to post a link but the searched items didn’t show. Screen shot of the search attached. Various thicknesses. Good luck with your search..
 

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SuzukiGS750EZ

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Thank you all for the responses. I’m going to go top to bottom in this thread and look into everybodiws suggestions. If anybody has anymore feel free to share.
 
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