CREDIT UNIT-FREE PLAY Your 1493 Princess can be made to FREE PLAY with a very simple modification. Notice in the picture below that there are three credit gears. These gears represent .05, .10 and .25 credits. When coins are inserted, these gears turn to give credit for the coin inserted and are held in place by a spring held keeper plate. Attaching a string/wire to hold this plate open, will never allow the gears to return to the off position. This is easily reversed if you want to return your machine to coin operation.