To be clear, the balls fail to stay put in the eye sockets, not the machine is kicking them out? If it's the prior, and you've bent the scoops/deflector plates back to a workable angle and still have an issue, then you've lost a fair amount of material off the front of the socket. Rebuilding is an option, but it gets hammered in that location so it may be a short lived solution. You can also try shimming the plastic eye socket cups down with one or a couple of #6 or 8 washers.(between bottom of pf and plastic cup) If this works, I would also clear coat(s) the front of the sockets to slow the future erosion.
Great game...., miss mine