Excellent build Rosbotics. I love the quality.
I have just built an air flotation spindle for my shop made T/C grinder and am now moving on to the matter of the stylus / finger.
It is hard to see the detail of your stylus holder, does it have two height positions so that you can set it to be easily switchable from primary to secondary relief?
If you have a drawing of the fixture, it would be great to see it.
Kind Regards
David