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I have a Mills High Top. The machine has had a hard life and many parts were removed and discarded over the years. The machine has a front load JP. The JP mech once had a reserve but now all of those bits and peices are gone.
I obtained a JP trip and reset push bar. After a little adjustment the machine will dump the jackpot just fine. now to the problem. The push bar will not reset and lock the trapdoor. Seem like it is an inch or more short. Is there and way to adjust this or am I going to have to do some welding?

If it is a front load jp there will be no reserve. There are a couple adjustment that can be made. They are hard to explain unless you are familiar with slot machines. Where are you located?

South Arkansas
I do not believe the JP mech is original.

I figured it out. Added 1/4 inch to the push bar and works like it should.