I built my own using a single pole single throw push pull temporary on when pulled. Turned a new knob out of aluminum stock with a wide shoulder at the base. Then I made a small Delron clip that held the knob out engaging the switch. The clip I attached to my jacket with some nylon cord. I realy liked it because the clip weighed next to nothing and I wasn't concerned about it hitting me while I was being tossed from the boat. ( "you could put your eye out with that thing") APBA passed it when they had me fire up and pull the clip.
