Any chance you could make the Coin insert plastics (20 cents) to suit the older Stern games. White plastic , and i found a part no. 4B-142 "specify coin".  I would take at least a dozen. If you need a sample i can send one to you. cheers Ralph ..

Hi Ralph

I am making progress, here is the model and should have a test print ready to go back to you for a test fit and then make any re-adjustments.

Jady