Well, here’s my two cents… Two pins stick out from the front plate. The whole barrel turns, controlled by a rod sticking up. You can mount points in the cavity, but the model T Ford timer method is a lot simpler: Put an isolated contact through the machined out part of the barrel, and a simple contact spring on the end of the rod. As the spring hits the contact, you make the circuit for a buzz coil.
Based on what I see, you can figure out how to tension the rotation of the barrel.
Wish I had a better drawing program on this computer.
T
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