I might (fingers crossed) have a lead on a black hole. I was wondering if it has any major maintenance issues because of the design and since it was the first dual playfield pin. Also, any specific things to look for before buying? Thanks!

this has ground mods done and some "playfield wear" which may make or break the deal depending on how bad it is.

i completely understand that machine wear and break. i guess the big question if most if it are easy to identify stuff (fuses, loose wires, broken parts) or stuff that difficult to diagnose (faulty component on the boards, electronics).