Here is a shot of the pan-tilt mechanism guys. Same as pic in post #136.
The 60:1 gearbox reduction is the heart of my GEM RA axis.
The smaller 120:1 reduction is the RA axis reduction of the
Scooter GEM
in combination with the worm set also shown.
All up, very well built and slightly over-engineered , like most good quality
US stuff. What you want for the guts of a good drive system.
Steve