I have a 1964 Gottlieb World Fair machin I restored 20 years ago. I have been restoring video games, slots and jukeboxes and newer digital based pinball units for years, but have not worked on any EM game since I restored this one This World Fair machine is my favorite and has been working flawlessly for years until now and I cannot remember how to fix this issue.
When you start the game up, it goes through the start up sequence properly and the game plays without failure except probably now 80% of the time during the start sequence the release arm will trap the 5th ball and not release it, basically closing to early. Can someone give me a direction as to which switch controls this in the start sequence.

Any help would be appreciated,

Ron