I was sick of the clean shot to the tower ramp rejects (yeah the ones that come out to the top or to the right of the right sling), to the point that the game felt clunky and I hadn't been playing it much.
Tonight I finally got around to filing the flap screw down like someone had previously suggested so the ball can't touch it and it made a HUGE difference.
Every single clean shot to the tower (at least 20 or 30 in a row) sailed right through smooth as butter!
On mine you could see where the ball had been hitting it, if you can't, just mark the inside edge before you remove it and file it away, i had to take a little off the top as well.
As long as you can still grab it with a #1 bit in there you are good.
Once you get it so the ball clears it completely I guarantee you will notice a difference.
That little detail has brought back the fun and flow of this game for me, just knowing that if I hit it clean it WILL go through and that shot feels so good when it does but is REALLY annoying when it doesn't.