I have NOT been very careful with my text and description of the barge position system.
In my motor control diagram and a lot of my text I have labeled the motor as a servo, and in fact it started out life that way. But, I have removed the signal wire from the servo and it is now just a DC motor with a stack of gears on top of it that reduces the output speed. It still looks very much like a servo.
Anyway, I got a DPDT slide switch and used one of my push button switches and made an enclosure from an old parts box.
Now, back to why the cable wants to creep on the drum and tangle.
Jim