Model man,
Thanks for the comment. I'm with you on the eyesight! Here is a shot of the bench with a lighted mag viewer! I have three of those suckers at each one of me hobby/shop areas!
In the other pic you can se e the cast slew ring. I'm going to try exactly what you suggest, using a rubber wheel on a servo to drive up against the ring. Hard part will be finding space in the cab for the servo, in the right spot!
Jim