Ordered the replacement timer (perfect match, packed nicely, and delivered on the 3rd day after order!), sprayed a tiny bit of grease on the motor gear, and a little silicone spray on the control wheel, and installed the part.
Also, noticed that a badly balanced wash load could cause the tub to slam into the edge of the timer. I fashioned a cushion out of heavy foam and attached it under the center metal brace on top, to dampen the upward movement of the drum.
New timer works great. Time will tell if the damper helps...