Ball is getting struck in tower, before it reaches the switch assembly at the bottom. It's stuck tight enough so the ball search does not shake it loose.
If you tilt the playfield front up a bit, to slide it forward, the ball usually comes loose but not always.
I dropped a few balls into the tower by hand and it seems that the tower plastic "drop hole" is either too tight or the lip at the bottom is too large.
If the ball gets stuck, and that's about every time it goes there, the glass has to be removed and either the playfield needs to be tipped or I have to use my finger to push the ball thru to the bottom, where it then falls into the playfield lane.
This is a real pain; please advise on solution.
Robert Fellows