I have had my eye on this item for a few months at a local second hand shop. I saw this weekend that the seller finally got a bit desperate and put an ad in the local paper in an effort to sell it. I went back to check it out and offered him $200 cash, which he readily took with the agreement that I can test it in any way I want but he's not selling it as a completely operable unit. I had no problem with that so I bought it after testing it for an hour or so. Everything works decently except the score rolls, but all of the mechanicals are intact so I'm thinking it's a worn connection someplace or maybe even just dirty contacts. I'm going to fully restore this baby, and when it's done, this will be a true showpiece.
http://www.distantsoil.org/~chad/arcade/Bowling_Mech/