0.05mm Increment Grip for M3x0.5pitch 42ridge Knurled Thumbscrew

A 'calibrated' thumbscrew grip.

Allows you to accurately correlate how much you turn it with the distance the hotbed will move. ( Assumes you have the usual M3 0.5mm pitch thumbscrew thread. )
ie: Rotate to the next:
... DIFFERENTLY-sized knob and your hotbed will move 0.05mm.
... SAME-sized knob and your hotbed will move 0.1mm.
One complete rotation is - of course - a 0.5mm hotbed movement.

Mount it either:
1) Completely remove one thumbscrew and slip this 'grip' over the top. Re-att