The big center plastic was busted in half on my Jacks Open (they ALWAYS were!) This was before anybody was making repro plastics sets. Probably before the internet existed too. So I went to a copy place, made a color copy of the art, cut out my own clear plastic and stuck it on there. Didn't even look close to original but hey, wasn't busted anymore. Like I said this was a looooooong time ago!
I made a few bakelite flipper linkages too back then out of a small sheet of bakelite. I still have it.