Welcome to the SMC forum.
There are a lot of knowledgeable collectors on here who can help you with questions. I don't know much about that machine but if it uses the Coinco 9300 type of mech, I would think these instructions would get you the desired results. http://soda-machines.com/discussions/index.php/topic,871.0.html
I have a Cavalier USS 64 and the switch is located such that it is activated by the coin return lever.
Pictures would also help people give you ideas of what would work for that machine. Good luck!