Most bottom bracket shells have an internal thread to accept bottom bracket bearing units from numerous manufacturers.
thread cutter bracket Bottom
Find More Posts by southpawboston. Originally Posted by southpawboston. DO NOT rotate facer counter-clockwise, this may dull the facer teeth. A proper tap is always best.
Description of Cyclus Tools Bottom Bracket Threading Tool
Machining the shell face improves concentricity. Rim aligning tool for pushing out dents. France for example now uses the ISO 1.
