Thanks James but have you seen the price!! Over 100 per tap size. There are tapping collets available (Standard ER collects with a squarenhole at end to fit specific taps) at about a quarter of the price. Trouble is the collet holders are not available in R8. Question still is how do springs allow the tap (held rigidly by the collet) to float in the holder.

They have to be able to float in all 3 axes but still apply torque to the tap?

How are these floating holder designed?