Merry HS175C. Its a Japanese tool meant for removing electrical connectors.
Knipex 36 12 130 Electronics Mounting Pliers
Xuron 496 Split Ring Pliers
I reach for one of these about 50 times a day at the locksmithing bench:
This is my favorite, I find it very efficient soldering station


I ordered it because of your thread and it's really useful. Thank you!Whats your favorite unique tool?
I don't mean wrenches, screw drivers, ratchets, or the sort, unless its some kind of unique variant of the tool.
Recently for me its been the Merry HS175C. Its a Japanese tool meant for removing electrical connectors.
Been using it a lot not only on the cars, but also on a couple computer builds.
It really saves the fingers and fiddling around.
https://www.amazon.com/gp/product/B002P90NCY/?tag=atomicindus08-20


Mine? Adjusting the valve clearance on P&W R2800's etc.ok, but what is it? what's it for?![]()
Mine didn’t ship for a few days either. Received mine 7 days after I ordered them. Haven’t used it yet but it seems like a quality tool.

I use these a ton, not for surgeryActually thinking about getting longer ones too!
https://www.amazon.com/gp/product/B0066DSTOE/?tag=atomicindus08-20
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I ordered them from him but he cancelled the order.
Wonder if he ran out of them after the surge of sales caused by this thread.
I ordered it because of your thread and it's really useful. Thank you!
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I use these a ton, not for surgeryActually thinking about getting longer ones too!
https://www.amazon.com/gp/product/B0066DSTOE/?tag=atomicindus08-20
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Pittsburgh (Gasp!!) SKU#98484
3/8 in. Drive T-Bar With Flexible Ratchet....with a 3/8-to-1/4 adaptor and a 10mm socket attached saved me quite a few times. The roto-head at the end makes it all possible.
I have the Merry HS175 and it's great when there's room to use it. I've had multiple times where it won't fit - no fault of the tool.
My favorite is the Lisle 63250 oil filter tool. They make a larger size also. The 63250 is probably all you need unless you work on huge engines. No need for the cup sockets. It works fantastic and is a bargain.
Runner ups are
Proto 251G snap ring pliers for manual transmission rebuilds. Wilde probably makes these and has a similar model
Lisle seal puller 58430
If you do much work on Olde MotorBikes, there's a pair of long nose Motion Pro snap ring pliers that you WILL need to reach waaaaay down inside master cylinders. There's just no other good way to accomplish this task.
Gas burner pliers. Utica, Pexto and C.S. Osborne made the best ones.
Pittsburgh (Gasp!!) SKU#98484
3/8 in. Drive T-Bar With Flexible Ratchet....with a 3/8-to-1/4 adaptor and a 10mm socket attached saved me quite a few times. The roto-head at the end makes it all possible.
I bought one of those in 3/8” when it first came out and it really saved my bacon a couple of times getting to impossible to reach bolts.
They really come in useful in so many situations.
Whats your favorite unique tool?
I don't mean wrenches, screw drivers, ratchets, or the sort, unless its some kind of unique variant of the tool.
Recently for me its been the Merry HS175C. Its a Japanese tool meant for removing electrical connectors.
Tagged for later.
Plenty of good tools here to consider. Sorry, no pics of what is described, below.
I have several different long-reach pin-nose pliers for removing internal snap-rings on vintage master cylinders. I recently bought a set from Astro, as you can never-have too-many tools, right? I've also made-do with a strong pick, to remove one end of the snap ring from its grooved land and then worked-around the perimeter of the snap ring to remove it. Having a dedicated set of pliers is definitely the way to go. Quicker, easier, less-frustrating.
I also made a tool for removing the piston in old Honda SOHC engines' front brake master cylinders, it works like a charm, and it's never been defeated. It was written-up in Cafe' Racer magazine last year.
A tip on honing the master cylinder bores after the piston has been dislodged/removed: I use a 3/8" long socket extension with (usually) wet or dry sandpaper wrapped-around it and one of those HFT hex-to-3/8" square-drive adapters chucked-into a drill, to ream-out the master cylinder bore. Remove the sandpaper and blow-out the debris from the bore, and wipe off the crud from the sandpaper, re-insert, and ream again. Two minutes of work should have that bore clean as it's gonna-get.
The other think I like to use, which is a big time-saver, is a ~60 ml syringe and a short piece of 1/4" I.D. clear plastic tubing, I use to reverse-bleed hydraulic brake and clutch systems on my bikes. I don't have any ABS-equipped bikes, so those of you who do, disregard this post, and this technique, as some have voiced the opinion you could render ineffective the ABS due-to migration of brake fluid debris in-suspension into the valving.
You got my interest. Do you mind sharing a picture or description?
I have the Merry HS175 and it's great when there's room to use it. I've had multiple times where it won't fit - no fault of the tool.
My favorite is the Lisle 63250 oil filter tool. They make a larger size also. The 63250 is probably all you need unless you work on huge engines. No need for the cup sockets. It works fantastic and is a bargain.
Runner ups are
Proto 251G snap ring pliers for manual transmission rebuilds. Wilde probably makes these and has a similar model
Lisle seal puller 58430


Found a different Japanese maker of a similar tool with much longer fingers.
Its called the JTC4586, it certainly doesn't look as stout as the Merry, and im not sure of the COO, but certainly looks like it can reach further with those long fingers.
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Not super-unique, but wouldn't want to try to change the spark plugs on my boxer-engine Subaru without these -- barely any room between the plugs and the frame rail:
View media item 100591
https://www.gearwrench.com/gearwren...e-6-point-magnetic-swivel-spark-plug-set.html
Edit: Initially I posted the 5-piece set but actually I have the 3-piece set, and that's enough, at least for a 2009 STi; I think I used all three too. While I was looking for the pictures I came across some posts that said you have to raise the engine 5 inches to change the rear plugs in a BRZ - lol, note to self don't ever get one of those.
My favourite unique tool is jigsaw as I saw on http://toolsbros.com.