The BTS-1 is an excellent precision tool system. It's designed to tap threads in a frame's bottom bracket shell precisely. After tapping, the taps guide the included facing cutter, ensuring it stays perfectly square with the bottom bracket's axis to clean up the shell faces. This set includes a 1.370' x 24 TPI right hand tap for English adjustable cups (part #691), a 1.370' x 24 TPI left hand tap for English fixed cups (part #692), and a 45mm facing cutter (part #690). Also available is a 36mm x 24 TPI right hand tap for Italian models (2 required, part #693). Remember to use cutting fluid like Park Tool CF-2 during machining and check Park Tool Sharpening Services for tool sharpening.
To use the BTS-1 tool set, first select the appropriate tap according to your bike's bottom bracket type. For English adjustable cups, use the 1.370' x 24 TPI right hand tap (part #691), and for English fixed cups, use the left hand tap (part #692). Start tapping the threads in the bottom bracket shell carefully. Once tapped, use the taps as guides to position the 45mm facing cutter (part #690) and clean up the faces of the bottom bracket shell. If you have an Italian model, you'll need two 36mm x 24 TPI right hand taps (part #693). Always use cutting fluid like Park Tool CF-2 when you're doing the machining work. This helps the tools work better and last longer. For tool sharpening, head over to Park Tool Sharpening Services. Keep your tools clean after each use and store them in a dry place to prevent rusting.
