This page will feature the various synchronous motor drives that were available for the different models.
This synchronous motor drive was featured on a Model 152C; it belongs to Will Thornton and is now on his Model 155
A drive identified for a Model 160:
A drive for a N-S/Polarex Model 131 (Courtesy of Stephen Brennan):
A Synchronous Drive Motor for a Unitron Model 510 (Courtesy of Dave Komar):
And several Synchronous Drive Motors for 6 inch models: