I've been working on a 1960 Williams 21. There are still a few things that need attention but I am finally close enough to play test it. When the ball hits the center pop it triggers the tilt. The other 2 pops seem to work without any trouble. Upon visual inspection coil looks fine. I'm sure I will figure this out but I didn't have time to dig into it this weekend. Now I'm at work thinking about it and was wondering if anyone else had ever encountered a similar issue.
Oh yeah, I did check the tilts switches and I'm sure this isn't a vibration issue.
Any input is appreciated.