Wow! The D3 appears to be almost exactly like the MMC from the photograph. I will write them and see if the gear sets are available as a replacement part. I did some careful measurements with a digital caliper and it appears that the gears are 100 pitch, 22 tooth, 1/8" shaft and 1/4" O.D. The most of the teeth are stripped so I had to do some interpolation. Thanks for the links. I will also check out the gear mfg site.

Dale