I recently worked on a Flip Flop with an interesting observation regarding the Double Bonus. So, there are separate Instructions cards for Double Bonus given on Ball 3 and Ball 5 (last ball) and others for just Ball 5 (last ball). The logic on the schematic shows jumpers between the 3 and 5 Ball positions for the scoring and playfield light (see pictures). Here is where the story gets interesting. The game I worked on (mid run serial number in the 4000s), looked to be a normal production run. There were no jumpers between the Ball 3 and Ball 5 positions. A close inspection revealed no leads were EVER attached. The backside of the rivets on the Ball Count Unit disc were void of solder indicating no jumpers were ever installed. This made the game Double Bonus on the last ball ONLY with no way to adjust. There is no adjustment plug inside the game and no mention of an adjustment in the manual. I can almost see why a Double Bonus is not desired on both positions for a 5 Ball game since scoring can be super high (I got over 200k with just the last ball bonus). One problem with this is that should the game be placed in 3 Ball mode, you won't get any Double Bonus. This made for even more questioning why they game was produced this way... Anyone else have this on theirs?