Cotter Pin Drilling Jig.

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Pep C Strebeck
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Cotter Pin Drilling Jig.

Post by Pep C Strebeck » Fri Oct 09, 2020 3:45 pm

I wasn't even looking for this or anything like it when I found it, but I wasn't going to let it slip by once I saw it.

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It had been listed for a while and had a good number of watchers, I made and offer and I am happy to have it. To be honest the thing looks N.O.S. like it was never used.
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It is a very well made and nicely finished piece. Everything is ground and chamfered, it even tells you what number drill to use, and the whole thing is Case Hardened. Even if I did have to pay 10x the original price on the box I still think I got a great deal. I will post a couple of photos of it "set-up" for use right after this post (5 photo limit).
"Remember son, there are two ways to do this: The right way, and your way” Thanks Dad, I love you too.

LOOKING FOR A LUFKIN No. 9A Height Gage Attachment.

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Pep C Strebeck
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Re: Cotter Pin Drilling Jig.

Post by Pep C Strebeck » Fri Oct 09, 2020 3:48 pm

I am showing it with a tie rod bolt installed (the only thing that I had handy when I took the pictures). With the jig on its side, you install the bolt until it sets flush to the bottom and then tighten the set screw.
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Next, turn it back over and drill your hole.
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You can see in the following photos that the hole in the tie rid bolt lines up with the guide hole in the jig. I checked this against some other random Model T and A bolts and all the holes lined up perfectly.
IMG_6881.JPG
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"Remember son, there are two ways to do this: The right way, and your way” Thanks Dad, I love you too.

LOOKING FOR A LUFKIN No. 9A Height Gage Attachment.

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Topic author
Pep C Strebeck
Posts: 519
Joined: Sun Jan 06, 2019 11:12 am
First Name: Joseph
Last Name: M
Location: MI
MTFCA Number: 0

Re: Cotter Pin Drilling Jig.

Post by Pep C Strebeck » Fri Oct 09, 2020 4:05 pm

Here is a copy of the brochure/instructions that came with it.
instruc1_2.jpg
instruc2_2.jpg
"Remember son, there are two ways to do this: The right way, and your way” Thanks Dad, I love you too.

LOOKING FOR A LUFKIN No. 9A Height Gage Attachment.

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Steve Jelf
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Re: Cotter Pin Drilling Jig.

Post by Steve Jelf » Fri Oct 09, 2020 5:16 pm

IMG_1254 copy.JPG
My home made one only takes a couple of sizes, but it works OK on them. I was lucky to have a thick enough bit of scrap.
The inevitable often happens.
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big2bird
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Re: Cotter Pin Drilling Jig.

Post by big2bird » Fri Oct 09, 2020 6:11 pm

Nice find.

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VowellArt
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Re: Cotter Pin Drilling Jig.

Post by VowellArt » Fri Oct 09, 2020 6:21 pm

Nice find, but wouldn't that screw mess up the threads on that bolt your drilling for the cotter pin? I mean to secure it you'd have to clamp it down quite a bit wouldn't you?

Me I don't like cotter pins, I prefer vibration proof nuts...not period, but they work far better than cotter pins do...and you don't have to straighten anything (like that blasted pin) to reuse it either.
Fun never quits!


Original Smith
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Re: Cotter Pin Drilling Jig.

Post by Original Smith » Fri Oct 09, 2020 9:53 pm

Langs sells them. I've used mine a number of times. I'd rather have that original though!


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Re: Cotter Pin Drilling Jig.

Post by dhosh » Fri Oct 09, 2020 10:08 pm

What is it made of? Looks like alunimum.
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Dan B
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Re: Cotter Pin Drilling Jig.

Post by Dan B » Sat Oct 10, 2020 6:02 am

Really really neat. I would put it to good use! You did good!
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Corvette Guy
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Re: Cotter Pin Drilling Jig.

Post by Corvette Guy » Sat Oct 10, 2020 10:13 am

I wish I knew about these before I broke a couple of center drills and regular drills. You can also use the flat of a nut backed against another nut to drill the hole.


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Re: Cotter Pin Drilling Jig.

Post by sweet23 » Sat Oct 10, 2020 11:42 am

Great find for anyone with an antique car. "You will love it better'n your money"


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Re: Cotter Pin Drilling Jig.

Post by Dropacent » Sat Oct 10, 2020 12:29 pm

It’s hardened steel ,Dave. Great find! Wish it was mine

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Re: Cotter Pin Drilling Jig.

Post by ivaldes1 » Sat Oct 10, 2020 2:47 pm

They have cheap metric ones on amazon. I found this SAE one on amazon is it any good? https://www.amazon.com/Allstar-ALL10122 ... ive&sr=1-1


John Page
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Re: Cotter Pin Drilling Jig.

Post by John Page » Sat Oct 10, 2020 3:38 pm

Pictured is one I made. John Page, Australia
Screen Shot 2020-10-11 at 5.35.13 am.png

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