Kerst, thanks!
I ran the poor thing in the dirt and spun a set screw on one motor, so into the shop. Cleaned a bit and put a new set screw in. Then I took it back to the sand pile and it had a nice squeak and I hope I figured out my low audio volume so I recorded another short video. The squeak is classic!
http://youtu.be/wgfCpIFZDwE
Jim