New Byers stepper drive controller w/ two motors, originally
Ed Byers sold these for about $2000 plus an additional $175 each
for the motors. Controller is programmed to drive the motors
at 1 RPM for sidereal rate, so as long as you have existing
reduction gears for a 1 RPM motor, this unit will work for you.
Comparable stepper drive correctors run about $2500. Email
if you have any questions. Selling the
entire system for $1200 plus shipping.