Scarlson saves another!
 

A friend gave me a Bridgestone MB-3 with a bit of a problem:

https://cimg0.ibsrv.net/gimg/bikefor...15ce6f9f3.jpeg

I rang up [MENTION=197010]scarlson[/MENTION] to see if could repair, and he said eazy peazy.

First we needed a sacrificial canti post (the threaded part at least):

https://cimg1.ibsrv.net/gimg/bikefor...f43a78460.jpeg

Sam used a trimmed bolt as a means to join the new post and what was left of the old one (not shown is some tapping, filing, and sandblasting). All set for some torching and some silver solder:

https://cimg7.ibsrv.net/gimg/bikefor...35d0a6383.jpeg
https://cimg9.ibsrv.net/gimg/bikefor...8eac09123.jpeg

Braze complete:
https://cimg8.ibsrv.net/gimg/bikefor...b0aa03114.jpeg

I’ll do a bit more cleaning up, some touch-up paint, and then some sort of beater build. Nice save, Sam!

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Boss!


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I have this same problem on a Bianchi Volpe, but my bosses aren’t threaded. She’s currently fixed until I remedy the problem.

Glad y’all could keep her on the road.

Ooooh, you took pictures! I didn't even notice!

Thanks for the shout-out!

I remarked that the frame smelled a bit like sulfur when I first brought it in. We thus surmised that this cut-off canti post must be the work of the devil. Now it smells like Gasflux type H black flux and burnt enamel. I'm going to say it's officially exorcised! :lol:

Nicely done! Another frame saved, always gives me a warm fuzzy feeling.

https://cimg8.ibsrv.net/gimg/bikefor...1f3daa04e0.jpg
1989 Centurion Prestige back in hill fighting mode thanks to scarlson 's repair of the broken RD hangar. If he could only weld bigger quads onto my birdy legs.
https://cimg1.ibsrv.net/gimg/bikefor...73af275ee3.jpg

Found a can of spray paint with a bit left. Good enough match for this beater:

https://cimg3.ibsrv.net/gimg/bikefor...bbead19cc.jpeg

Man I love these threads. Hope I can get up to Scarlson’s sometime!

You are welcome anytime! Broken bikes and beer are also always welcome. ;)

Could one also drill out the threads in the frame and Helicoil? (Obviously I’m not familiar with canti’s)

The threads were ok, though. I wasn't really repairing threads. A helicoil is only really useful for threads. And it might not work in a stripped canti post either, because the walls of the post are so thin.

The problem on this bike was that the post that the brake pivots on had been cut short, leaving only a stub with a few threads. My job was to add some length to it, so a brake could fit on it again. I did this by screwing a small threaded stud into the threaded hole in the remaining stub, then threading on a piece of an old cantilever post, and finally brazing everything together using silver. This created a nice robust repair, stronger than the original.

It could also have been done with JB Weld instead of brazing, or even with nothing at all - just a long m6x1 bolt to mount the brake arm with the missing piece screwed on in the middle. But brazed-on, this is a sort of "gold standard" repair, and was pretty interesting/fun to think up and do.

Now I’m tracking. Way more fun doing the “gold standard” repair.