I wanted my Fast Draw gottlieb pinball to “free play” There is a solution to short the zero_Position swotch on the Credit Unit. But this solution is now totally “clean” for me as you don’t see the credit, the game starting immediately when you push the replay button… So I have created this part that you can insert into the coin back lever in the door. Now when you push the coin back button you get a free play, the credit counter increments properly. And if you want to use this credit, simply push on the replay button ! https://youtu.be/r5GKp98Q4KA

Source: Gottlieb EM pinball Coin Door hack by f2knpw