dmw010

I made a mistake and overtightened the seat tube clamp on a 1997 Campy Avanti front derailleur. It snapped the pin in the clamp pivot. The clamp is integral to the derailleur, so I can’t replace it. I got the pieces of the pin out. See photos of clamp and pin.

I’m rebuilding a low-end 1997 Bianchi with its original parts, so I’d love to repair the derailleur. Any suggestions for sourcing a replacement pin?

Or anyone got the same derailleur they don’t need?

RGMN

Find a spring pin that fits

dmw010

Thanks, that’s a helpful link. I’ll measure the pin diameter with calipers and see what I can find.

JohnDThompson 

It's just the pin that broke; the clamp and derailleur body are intact? You shoukld be able to replace the pin with a piece of steel rod or even a nail. I used a finishing nail to replace the pin on a vintage Huret Jubilee front derailleur.

dmw010

Yes, the clamp and the rest of the derailleur are fine.

Its a little tough to accurately measure the pin fragments (they got a bit deformed), but looks like about 2.5mm diameter and 14.5mm long.

JohnDThompson 

I'd take the clamp piece to the hardware store and test-fit a bunch of steel rods, nails, etc. to find the best fit, and buy that one.

dmw010

I’ve discovered that the actual part is a hinge roll pin, and you can actually get a Campy replacement:

https://www.modernbike.com/campagnol...-roll-pin-each

Just need to confirm it’s the right part for this specific derailleur. But that would save a lot of time and effort!

dsbrantjr

They are also called roll pins. The fit is not really critical as long as you can clamp the derailleur securely. You could even use a nut and bolt or a piece of brass tubing and flare out the ends to secure it.

dmw010

Thanks, I just discovered what the part was called as you were posting this!

dsbrantjr

Once you get the new part, go easy on the clamping screw, you just need to keep the derailleur from moving; gorilla force is not needed. Is the clamp the correct size for the tube? It looks from the photo like it might be too small.

dmw010

Yes, clamp is correct - it’s original to the bike. And thanks for the warning. I was actually using a torque wrench but clearly had it set too high and wasn’t paying attention.

dmw010

Hi all!

After a brief delay, I have a new hinge roll pin. Now the question is: how do I install it? It doesn’t just slide in, so it’s going to require some force and/or lubrication. Do I have to compress the roll somehow to insert it? Also not sure if the orientation of the “roll” (clockwise or counter-clockwise) is important. I don’t want to screw it up (again), so I’m returning to the braintrust for advice.

fietsbob

Roll pins? they are flat strips rolled up, leaving a lengthways gap. so are forced in closing that gap somewhat
they got spring temper heat treated.
the springiness keeps them tight..
that should not need much force or it will possibly crack the hole in the aluminum.

perhaps file it down a little bit, to only be a hundredth ( 0.01~0,015 ) oversize..

dmw010

The pin is actually more like a piece of metal rolled up over itself, like a spring. I can see a couple of layers of metal.

Miele Man

IF, the pin is the rightsize but has a sharp square edge where you want to insert it into the derailleur I'd chamfer that edge a bit to help guide it into t he derailleur.

Cheers

dmw010

Just wanted to let everyone know the derailleur is repaired and reinstalled. I really appreciate all the advice. I haven’t been a regular reader or participant in these forums for many years, but it’s still a great resource!