I have to say I've made this "mod" too. At first I only used the magnetic tape on both sides, and I wasn't very happy of the result. There were many lock rejection, but at least no more STDM as the geometry of the shot was changed.
Then I found old broken turistic souvenir (the fridge quality) magnet, and used it on the lock flap. You will not believe it. No more rejection, had a blast of a game (about 479.000.000 points... of LITZ champion XD) and he only rejection was because of powerball (at least, it also doesn't go STDM, it goes on the slot machine upper post. Wild as ever, but manageable).
Thank you for this precious tip, it was on my todo list since at least a full year!
After reading through all these bounce out fixes, I opted for the most simple one, modified it a bit, and it has solved what was a 90% bounce out shots/rejects.
Now it is 100% no rejects/bounceouts.
Went to Home Depot and bought a selection of magnets and magnet tape but wound up only needing one rectangular magnet out of the selection.
Keeping it simple and more of a hidden fix:
I first tried a neodymium magnet on that angled flap but that was wwaaayyyyyy too powerful as it grabbed and held the ball.
Next I tried the rectangle regular strength magnet. Added double sided tape to the back of the magnet and additionally added a long screw as back pressure/magnetic attract just in case the tape ever looses its tac.
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