I built a collet chuck for my SL to allow me to use my TAIG collets on my SL. The TAIG headstock uses a 3/4-16 threads so I purchased a grade 3 3/4 bolt and cut 12-1 threads to thread it onto the spindle, then cut the relief for the collets. Used the standard TAIG collet nut to close. Runout is excellent, I couldn¡¯t get it to register on my dial indicator.
I have minimal machining skill, if I can do it anybody can. Not sure what thread the er16 collet nut uses, but I would start there.
Pat
