If you have a two prong polarized plug, just file the fat prong down so it will fit the socket either way.
If your game keeps blowing a fuse, just put a bigger fuse in. That's why they make multiple sizes. Keep trying until you find one that does not blow.

Use plain old plate glass when you replace playfield and translite glass. Tempered glass is a waste of money.
Or use a sheet of beat up, old, cracked, scratched, yellowed plexiglass.

Ouch! What backglass was it? Were you able to get another?

If anything significant goes wrong with your game it's toast. Nothing is ever worth repairing.
Just part it out. Cut the wire thingies holding everything together and sell the parts at your next garage sale. Except the computer lookin' stuff. That's all junk, just throw it away.
Make a nifty coffee table out of most of it. Sell that on Craigslist. Be sure to put in your ad that it's rare.