The sheer Volume of wire in this thing

Fun fact: if you took all the wire out of an 80's-era pinball machine and laid each piece end to end in one straight line, I'd be really mad at you

Pinball machines are designed to be very very easy to fix and swap parts out etc but Williams absolutely did not expect anyone to swap out The Actual Bit Of Plywood In The Middle Of The Electronics Sandwich

Like it's reasonable to have feelings like, oh, why oh why did they staple the GI braid in like that, but honestly they figured this thing would get hammered hard enough that you'd replace every bulb and rubber a few times, rebuild the flippers, do some board work maybe and then this'd end up in a skip having earned its weight in quarters, they absolutely did not expect Some Guy to be tearing it down this deep *checks watch* forty six years after they'd made the damn thing

Lots and lots of wire.

See Williams used a matrix for the lamps as well as the switches. So you have eight transistors on one end to let the electricity in and eight more on the other end to let it out again, to turn on one lamp you go "Turn on the transistors on row 2 and column 3" and you could control 64 lamps with 16 transistors. Bally just had one transistor per lamp

A playfield swap/restoration is the second hardest thing you can do with a pinball machine aside from trying to restore a flaked backglass (you have to match the colour AND the transparency and good luck with that)

I saw a reddit thread about a lady who bought a Bally machine, I think it was a Xenon or a Space Invaders or smth like that, anyway all the paint was ground off my the ball and her feller thought he'd do something nice to surprise her and he got one of those made-brand-new reproduction playfields with the automotive clearcoat, they're like seven hundred bucks. Anyway he took all the stuff off the old playfield and then realised how deep in over his head he was and left it in buckets for ten years