Gear Combo Guru
Join Date: May 2007
Bikes: Spec' Tarmac (road), Ridley Fenix (commuter & fast tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder)
I had a bolt head break off when installing it because of paint in a threaded rack braze-on a few years ago on a new frame. Since then, I've bought taps in M4, M5, and M6 sizes and tapped every braze-on on my new frames and on frames I've built up for friends and family - I've found many with paint in the threads. If the hole is already threaded, there is no need for power tools, I just have a simple manual tool, which is much less likely to cause problems.
Last edited by Chris_W; 05-11-11 at 11:36 PM.