Just bought a Williams Space Shuttle. It's not in terrible shape, the cabinet and backglass are nice, but the playfield is pretty rough. It had a thick layer of dust on it, so I wasn't sure I believed the previous owner when they said they'd played it recently, but I did believe them when they assured me that they had never opened the machine.
I'm going to start with cleaning, new rubbers and fixing things like the center drop target. I'll probably need to rebuild the flipper assembly. Later on I'm hoping to replace the ramp, the space shuttle and finally install a hard top on the playfield.
So far I've replaced a fuse and the batteries. At first it wasn't going in to attract mode, but suddenly it started working. Not sure if it's something I did or if it's going to come back and haunt me.