BRAND NEW 20" Byers Starmaster Research drive system, first $2300 takes it. This is a complete system, no longer needed, other than to fund another project by selling this gear below cost, and way below replacement cost.
The gear is 20" x 3/4" x 640 teeth, and includes all Byers components, not components made by 2nd or 3rd parties.
Included is a geniune Byers worm installed in a Byers spring loaded worm housing, which includes all reduction gears, and a Bodine synchronous motor.
Optional is a very heavy duty 3.501" clutch (for 3.500" shafts) with inner ball bearings of 0.0001" precision (1/10,000 inch) when moving or slewing in RA, add $300 if interested in the clutch. This is an $800 option, the bearings alone cost $275.
This is it, when it's gone, it's gone. I am keeping a larger Byers gear for my project, this one is not needed.
Buyer to pay shipping.