Frames - Does anyone have experience with Bottom Bracket Tap/Facing sets? - Bicycles Stack Exchange - Bottom bracket tapping
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This article will discuss use of the Park Tool BTS-1 and BFS-1 to perform various machining operations on bottom bracket shells. The BTS-1 is a precision tool system which provides a piloted means of tapping the threads in the bottom bracket shell of a frame. After tapping, the taps act as guides to keep the included facing cutter perfectly square with the axis of the bottom bracket for cleanup of the faces.