Watching your dad repair a bingo would have been a very slim line between addiction and nightmares 
But no doupt your dad made it look easy 
Dad imported these in the 50's, and knew them like the back of his hand. My uncle also knew these back to front. One of the games he imported is on eBay at the moment.
http://www.ebay.com.au/itm/1958-BALLY-Beach-Time-Bingo-Pinball-HIGHLY-COLLECTABLE-/170692906797?pt=AU_CoinOp&hash=item27be170f2dThis particular game must have been bought off Dad - I know it was one of his as he had the stainless steel door fittings custom made for most of the bingos, and the playfield is not original - it was removed and repainted when the games were deemed illegal in 1987.
