The coin door on my Bally Flip Flop has 2 slots, a right and a left. Both indicate 2 plays one quarter. Only the slot on the right (closest to key) can add credits as only that switch has the wire that activates when a quarter hits it. The manual and schematic specify a colored lead plug to insert into the cabinet block. The only colored lead plugs I see are for the 3rd coin chute which has option of 1 to 6 credits per coin (apparently the right coin slot is the 3rd coin chute). So I plug the lead into the #2 hole for 2 credits per quarter. But when I deposit a quarter or manually trip the coin switch (wire) no credits are added. When I manually add a credit directly to the Credit unit in the Backbox, pressing the Start button still does nothing. Switches on coin door check out okay. Just not sure where I should be placing the colored lead plus. I appreciate any direction.