Then look for "this old pinball".
They did a restoration in it. These clowns that make it are kinda irratating, but they get the point across.
I don't blame you though. It's a total nightmare to contemplate taking apart a playerfield. There are sooo many little parts and soooo many solder points.
You could just buy one and replace the old one. Kinda pricey, but if you like it, you like it.