[raymo]

Version 04.05.17 Russell. I've marked both gears Lewis, no slippage;
anyway my latest problem is with Declination, and the Dec motor is of course not running during imaging. [unless using an autoguider of course]. I adjusted the meshing a couple of months ago. Couldn't eliminate the backlash entirely without getting a tight spot.
Collimation is pretty good Kevin, and the scope had been outside nearly 1.5hrs last night before I tested the tracking, so I wouldn't think it would be tube currents. Balanced with a little bit of weight against the drive. I was going to do the belt mod, but I won't bother now.
Thank you all for your thoughts.
raymo