Ball is not in part. - is my problem...

Go-NoGo guage pin - I have already implemented, but checking 100000
parts is cumbersome. 100% inspection is never reliable. This is a
critical characteristic.

I want to do something when the ball is being inserted... or can this
process be automated. can a single ball be pushed in during pressing...
cfan the manual part in the ball insertion be changed to fixture or
something like that???

I get totally engrossed with ideas to settel this simle issue - I would
like a totally foolproof process capability