Did the Bally Bingo machines with metal legs use the 9/16" head size 3/8" leg bolts
or the 5/8 head size leg bolts?

Thank you -- I'll use 5/8" head bolts.

Thanks Robert. Unfortunately the bolt head size is not addressed on the site. I perhaps confused myself as the early Bally SS machines were using 9/16" head 3/8" bolts. I am working with a 1972 metal leg Bingo. I don't know the Bally EM pins used for leg bolts. I have both sizes and think the larger head as bingopodcast indicates may be a better bolt for the unusually heavy back end of the machine.

Thanks Nick. It would be reasonable to expect that the later Bally bingo machines would use the same legs and leg bolts as the regular pinball machines, but as a 1 and 1/8" ball and shorter posts are used on Bally bingo machine you can't be sure unless it is verified on an original machine.