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RPH

Well-known member
Joined
Dec 17, 2006
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4,190
Location
Michigan Thumb
I was taught that those are obstruction wrenches. Allows you to get around things, the starter example is perfect.
 

bobcatdan

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Jan 4, 2011
Messages
9,948
Location
Kaukauna,WI
Half moon wrenches. Personally I find them a good idea on paper, close to useless in real world. Everytime I find a spot they would be perfect for, not enough leverage to break the bolt loose that I end using another tool.
 

jd_1138

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Joined
May 8, 2013
Messages
17,042
Location
NE Ohio
Half moon wrenches. Personally I find them a good idea on paper, close to useless in real world. Everytime I find a spot they would be perfect for, not enough leverage to break the bolt loose that I end using another tool.

Yeah might not be a wise investment in a tool truck brand, but maybe grab some Craftsman/HF ones for $30 or something. Not even sure HF makes them.
 

Arkansas COB

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Joined
Sep 15, 2015
Messages
2,907
Location
Arkansas
My go to wrench when doing the head bolts on my Shovelhead engines. Allows me to move the wrench 1/4 to 1/2 inch or more at a time instead of 1/8 inch at a time with a straight box end wrench.

COB
 

RustyJunk

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Joined
Jun 11, 2018
Messages
274
Location
Pasco Fl.
I think I have a few of them somewhere but don't remember ever using them, they were my dads from when he was a mechanic in the 50's when they used to fix stuff.
 
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Al Borland

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Jan 20, 2016
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1,598
Used by Dr. Who to adjust the multidimensional areas of the Tardis.
"For those places a Sonic Screwdriver won't fit."
 

plinker

Well-known member
Joined
Feb 28, 2007
Messages
4,285
Location
Northern Wi
I could have used one on a '65 jeep starter this spring.

I have used the Gearwrench indexable DBE's I have though. Not daily but when nothing else works effectively they are great.
 

Lassen Forge

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Joined
Apr 26, 2014
Messages
15,056
Location
The romantic hills of central Umbria, Italy,
Getting the generator off a ford, adjusting the rear distributor on a mopar, pulling the starter off that chevy, pulling the water towers off a Detroit Diesel, or tightening up that damned kickstand bolt... I forgot what it was on, but I needed it for that, too.
 

MikeF2316

Well-known member
Joined
Dec 29, 2012
Messages
9,605
Location
Thornhill, ON
Pretty much this.
Been a mechanic a long time and never have I ever felt I needed a curved wrench.

While I only pretend to be a mechanic, I buy tools after the fact, ones that would have helped me out on a previous job, in case I ever do it again. I've never thought that style of wrench would ever have helped me. But then, I've never done any of those jobs listed by Lassen Forge!
 

WittHay

Well-known member
Joined
Jan 6, 2016
Messages
2,157
Location
Surrey, BC Canada
A Mac air compressor wrench and a Snap-on fuel pump/air compressor wrench. On old diesel trucks especially cabovers with Cummins motors. Bunch of bolts in a circle, tight up against the motor and blocked so you cant get extensions in. Also had to work around steering shafts and transmission shift towers.
 

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Dragfluid

ALLIANCE MEMBER
Joined
Sep 15, 2013
Messages
17,469
Location
Pillager, MN
I have a complete set of metrics that I bought off the truck many moons ago. Have used them a fair amount over the years.
 

Moose Legs

Active member
Joined
Jan 18, 2018
Messages
41
Location
Edmonton AB
I believe they are mostly used by diesel technicians these days. I’ve worked on industrial stuff where they could have made the work easier but weren’t entirely necessary. If I could spare the space on the service truck I might have picked up a couple.
 

DonglordActual

Well-known member
Joined
Dec 28, 2016
Messages
76
Location
Wichita, KS
They're in the same boat as a pass-through ratchet or twist-handle ratchet. They're incredibly niche but some specific job basically requires them if you're getting paid by the book hour rate. I can say that I've never had a use for them but I'm not a mechanic working on diesels.
 

5ktq

Well-known member
Joined
Mar 26, 2018
Messages
194
Don't think I've ever needed one. usually get around things with extensions, u joint, crowfoot, etc.

Probably useful once in a while (and from an era before that stuff existed).
 

WWheeler

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Joined
Jun 23, 2015
Messages
4,105
Location
Middleofnowhere USA
A set of them looks cool and stand out because they take up a lot of room in your box, and since you never use them they stay nice and shiny. :cool:
 
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