Glad to see you moved your questions here.

Th inserts need to be leveled and then glued. To change the score for replay, there is a connector on the bottom of the playfield for adjustments. The number of games per quarter adjustment is by the fuses. You will see connectors there, along with ball per game. Hopefully you have the connector cards on the sides of the cabinet when you open the coin door.

Check you switch alignment on the score reels and the one that is sticking, may need cleaned.

The pop bumper and extra ball would need some research in the schematic. I would make sure all your Jones plugs are clean and seated all the way before you start adjusting switch blades. They plug in under the playfield in the back of the relay board.

Here is my setup. 2 credits per coin, no 3rd coin shoot, 3 balls per game and credit for special.

20190207_113213 (resized).jpg

Your red box is credit / extra ball for special. They wrote it as high score. If you look at that connector, only two wires are used on the connector. Moving it up and having all 4 pins in the sockets changes it to extra ball (the two pins that are not used do nothing).

Enjoy

That 3 credits for high score is for Bally early Solid State games. That scares the crap out of my kids when they get a high score.

Cool find on the coin. Keep it in there somewhere for good Karma!