Second Attempt 1

Second Attempt to stick a stepper motor on the RA axis of my Skywatcher EQ3 mount.

Pros: Sturdier build, motor vibration compensated, quite stable.
Cons: Long usage leads to motor slowly shifting along the RA axis shaft, thus worm drifting out of its gear, which leads to gear worning...

Worm and gear are Nylon, bought from smallparts.com.au in australia, who are resellers of SDP-SI.