Scarlson saves another!
05-30-22 | 07:32 PM
#1
Thread Starter
Senior Member
Joined: Dec 2005
Posts: 18,841
Likes: 11,745
Scarlson saves another!
A friend gave me a Bridgestone MB-3 with a bit of a problem:
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):
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:
Braze complete:
I’ll do a bit more cleaning up, some touch-up paint, and then some sort of beater build. Nice save, Sam!
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):
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:
Braze complete:
I’ll do a bit more cleaning up, some touch-up paint, and then some sort of beater build. Nice save, Sam!
05-30-22 | 10:54 PM
#4
Senior Member
Joined: Jun 2010
Posts: 2,136
Likes: 1,524
From: Medford MA
Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem
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!
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!
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
05-30-22 | 11:04 PM
#5
Bike Butcher of Portland
Joined: Jul 2014
Posts: 12,493
Likes: 8,060
From: Portland, OR
Bikes: It's complicated.
Nicely done! Another frame saved, always gives me a warm fuzzy feeling.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
05-31-22 | 05:07 AM
#6
...
Joined: Oct 2021
Posts: 2,540
Likes: 3,496
From: Whitestone and Rensselaerville, New York
Bikes: '23 Canyon Endurace, '87 Bottecchia Equipe Professional
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.
Last edited by BTinNYC; 05-31-22 at 06:42 AM.
06-01-22 | 09:36 AM
#9
Senior Member
Joined: Jun 2010
Posts: 2,136
Likes: 1,524
From: Medford MA
Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem
You are welcome anytime! Broken bikes and beer are also always welcome. 
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
06-01-22 | 09:58 AM
#10
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Joined: Mar 2021
Posts: 1,980
Likes: 1,601
From: Beaverton, OR
Bikes: You had me at rusty and Italian!!
Could one also drill out the threads in the frame and Helicoil? (Obviously I’m not familiar with canti’s)
Last edited by RustyJames; 06-01-22 at 10:02 AM.
06-01-22 | 03:20 PM
#11
Senior Member
Joined: Jun 2010
Posts: 2,136
Likes: 1,524
From: Medford MA
Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem
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.
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
06-01-22 | 04:13 PM
#12
Senior Member
Joined: Mar 2021
Posts: 1,980
Likes: 1,601
From: Beaverton, OR
Bikes: You had me at rusty and Italian!!
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.
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.
