Hey Sonny;
Torque is indeed one of the benefit of using additional gear reduction between the motor and the worm gear though not my primary goal.? For me its tracking resolution.? I'm driving the mount with 400 steps/rev, NEMA 17 stepper motors.? The stepper driver is further dividing these steps by 32.? Add to this the additional 4:1 belt drive reduction I'm adding at the motor, driving the 180-tooth worm gear and this gives me 256000 steps/deg for RA/DEC, and a tracking resolution of 0.14 arc-seconds.
Not sure what Gilmore belts are but the belts I'm using are 6mm GT2 timing belt with a 60-tooth and a 15-tooth GT2 pully.
John Scherer