At 12:37 AM -0500 1/16/08, Adam Hammond wrote:
>Grant MacLean helpfully directed me here:
>
>http://www.asahi-net.or.jp/~uc6y-ssk/special_37.html
>
>If you look toward the bottom, you can see that Dia Compe sold a kit
>for mounting the GC centrepulls onto brazed-on bosses. I suppose
>this means they also sold special springs for the purpose. (I
>wonder if a Mafac spring would work -- they do connect with the
>brake arm in the same way as Mafacs: via the brake shoe bolt.)
>
>If anyone happens to have a lead on such bosses, please let me know.
>(I'd need the ones for the NGC450B brakes.) I'm also looking for GC
>straddle wires.
You can establish the correct dimensions from your brakes. Then it's an easy job to machine those bosses. The only critical dimensions are diameter and length of the pivot for the brake, the rest can be very approximate. Many framebuilders have a lathe, so you may ask the person who would put the bosses on whether they can make them as well.
Machining bosses is a lot easier than making custom brake springs! (Does anybody know how to bend custom springs? I need some for a restoration.)
Jan Heine
Editor
Bicycle Quarterly
140 Lakeside Ave #C
Seattle WA 98122
http://www.bikequarterly.com