Dirt Road Blues 

I made the mistake of assuming that the Record crank arms on my PX-10 would have been fixed to the bb spindle with typical Campy 15 mm bolts. And so I scored a peanut butter wrench off eBay.
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Pretty wrench. However, my excitement to test fit it turned fell flat when I realized that it didn't fit the bolts on the crank. It fits into threaded cavity of the arms, just not over the bolt heads.

The Peugeot originally had a Stronglight 105 crank fitted to a Stronglight Competition bb. It looks like the previous owner swapped the Campy arms directly into the Stronglight bb and used the French fixing bolts.



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Seems like these are 16 mm bolt heads. I don't know how they managed to get screwed into such a tight space, but they did. I have a 16 mm socket that I filed down several years ago to remove 16 mm bolts from a Nevar crank. And while that operation was successful, that same socket is too wide for the Campy arms. I think, and I hope that with some additional filing, I might be able to make that socket fit. t's worth a try.

If things go well, I'll be looking forward to changing the bolts out for an appropriate pair in 15 mm. Then at least I'll finally get to use this pretty wrench.

merziac

So you have some French thread Campy bolts and are sure they will thread into that spindle or?

And I would be happy to spin a socket down on the bench grinder and send it to you if need be.

Hopefully the one you have is robust enough to take down if the bolts are tight, I would get some PB in there preemptively for good measure.

Dirt Road Blues 

I'm not aware of bb bolts that are French threaded. Is that actually a thing? I do know that the bolts that my record crank is installed with measure just shy of 16 mm. And I have come across a set of 16 mm bolts in a French crank before.

merziac

No I'm sure you're right and yes I know there are 16 mm bolts, had a set recently that were wedged in where they shouldn't have been and they weren't tight so I got lucky.

oneclick 

They are all [1] "french" threaded, if you take to usual use of "french" in this parish to mean "metric".

[1] for large values of "all".

dedhed

https://www.bikeforums.net/classic-v...-crankset.html

norskagent

Park tools made 16mm crank wrenches, they show up on ebay occasionally. But, the park multi (14,15,16mm) crank wrench will probably not fit.

JohnDThompson 

By the time the Stronglight mod. 105 came out in the early 80s, Stronglight had switched to 14mm mounting bolts and 22mm extractor thread. The previous owner must have decided to unload the old 16mm bolts when selling the bike.

Mounting bolt thread is pretty standardized at 8mm x 1mm. The only exception I've run into is early production Lambert, which could be either 5/16" x 26tpi or 5/16" x 22tpi, depending on production run.

That's likely what needs to be done, although as you note, the socket will be weakened and may fail if the bolt is seized. In that case, the Park CCW-16 or Zeus "peanut butter" wrenches will work, but both tools have been out of production for decades. An established bike shop may still have one.

Kabuki12

As a tool grinder with my own shop I have , on occasion, ground hand tools to fit certain applications before I actually bought bicycle tools designed for what I need to do. I have a socket that I cylindrically ground for crank arms and it has held up fine and does a great job even though i now have a Campagnolo peanut butter wrench . I have made cone wrenches to do the hub bearings and they worked very well, but I ended up buying Campagnolo cone wrenches for the job when I saw a good deal on some. There is nothing wrong with modifying a tool if done correctly, mainly not heating up the tool with the grinder and taking material off equally around a 6 point socket. With a universal grinding machine and coolant both can be achieved. I have also modified wrenches for aircraft assembly in major aerospace companies.

juvela

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Launch annum for the Verot model 104 and 105 chainsets was 1977. This was the time when the range received a reworking with the discontinuance of model 93 and the revision of model 99.

Models 104 and 105 first began coming through on new model 1978 cycles. One such example was the launch of the Peugeot PFN10 bicycle.


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JohnDThompson 

It helps to start with a decent quality socket, i.e. Snap-On, Proto, Mac, USA Craftsman, etc. Cheap sockets are made from lower grade steel; that's why they have thicker walls. A USA Craftsman 15mm socket will fit in the 22mm extractor opening without needing modification; a 16mm socket will not.

Mad Honk 

DRB,
I ordered a box of 100 8X1mm bolts that are 1mm longer than the Campy bolts. The heads are all 13mm and by adding an additional washer the grip depth is the same. It allow for an easy removal and install with a standard 13mm socket. If you need or want a set let me know and I will put them in the mail. Smiles, MH

wrk101

I had to ground down a 16mm socket on a bike I bought at a co-op. They put a Shimano crankset onto a Stronglight BB and reused the 16 mm bolts.