Mills Jackpot Vender question

[rosstfr]

This machine seems to be very nearly complete, however it is missing the jackpot trip lever or assembly. In the event of a jackpot, this would have pushed out towards the player against a lever on the jackpot to trip a jackpot payout. If anyone could recommend a reference that shows this clearly, or has closeups, I would appreciate it. I haven't had any luck online and the parts haven't been forthcoming in my searching...
thanks!