08-06-2013, 03:50 AM
It looks like that broken Bakelite part is a switch made by Cutler-Hammer, I'm not sure how common or unique it is though. My guess is that it's purpose is to either kill the motor when the dial gets to the end of travel, or reverse direction. Fortunately the mechanism is very straightforward compared to an Airline (Wells Gardner) automatic tuning mechanism.
Regards
Arran
Regards
Arran