S&S Coupler Installation Procedure S&S Couplers “in the raw”. Beautifully and accurately machined stainless steel. With the frame geometry locked into the frame fixture, coupler locations are marked. After rough cutting with a hand saw, the tube ends are machined perfectly square and to the exact gap dimension. Here the gaps are precisely fitted and the tube ends cleaned of finish in preparation for brazing the couplers. This is how the couplers look after the brazing flux is removed. Coupler conversion is complete. Ready for new life as a travel bike.
