I thought I had that damn thing fixed, then the auto plunge stopped working again.
The manual plunge still works 100% of the time, so you might be one to something with the prongs.
Was thinking of upgrading the coil to have a little leeway, since it's currently maxed out via factory defaults.
Not sure if this was already posted, but I think part of the problem is even if you get the ball guide set 100% correctly eventually the ball guide will move from the ball slamming against it enough times. It doesn't take much to through it off.
on mine there was a #8 screw holding down the ball guide and you had to push the shit out of the ball guide all the way forward and then tighten it.
I added some wood (toothpicks ) & wood glue to the hole so I could put a # 6 screw in it's place. This would allow a small amount of wiggle room, so if the ball guide wouldn't have so much pressure on it. Think the only other option would be to patch the current screw hole and move it down a few mm. (closer to the middle of the correct ball guide mounting point.)
Just keep trying, eventually the magic combination will be found