Hi Micheal,
Thank You for the tip! Actually I did use washers in the more traditional sense when I put in my new gearboxes today. It turns out that one of the bolts was not going in all the way (suspect a piece of a previous bolt must have blocked it), so I added three flat washers to keep the gearbox tight against the mount. Works Good!
HOWEVER, now the new motor, upon putting everything back together races uncontrollably and then stalls. This is the DEC. The RA, which has a new gearbox, too, runs great. Did the motor controller get fried? I accidentally pushed in the DIN connector at an angle, and it bent the top pin. I pushed it back, and it slides in good, but the motor just races and abruptly halts, with "RA Stall" on the HC. I manually turned the worm gear, and it turns easy and smooth, so its not mechanical.
Clear Skies,
Paul