Guys, I'm wanting to mount an older Campy NR rear derailleur onto a new (aluminum) De Bernardi Zonal frame, but the derailler hanger is 10mm x 1 threading, rather than the 10mm x 26 found on the Campy hanger bolt.
My question is, can I simply take a NR derailleur bolt and slowly work it in with oil, and occasionally backing it out to clear the threads, or is there a better method? I want to do this right.
Apparently it is impossible to get a 10mm x 26 tap to retap this hole.
Thanks for your help,