Mills Dice help

[PA23]

I've completly rebuild the mech in my Mills Dice. It seems to work well so far, although it took a little bit to get the coin head "feelers" adjusted just right.

My problem stems from when the machine is put into the case, if I understand correctly its the interaction of the spring loaded lever in conjunction with the main lever (on a normal slot I'd say the pork chop) and the post on the arm going to the coin head.

What happens is either nothing engages or if I pull the machine out slightly it always engages. How do you go about adjusting this? Of course visibility into this spot with the machine together is next to nil.

TIA..