Quoted from Thor_Odinson:
My TMNT Pro is an airball machine. It mostly happens when I brick my shots on the left ramp (which I do almost every attempt) and hit the dimension x targets. Does anybody else have issues with the balls flying in the air from the dimension x targets?
What I've done so far...
1) Turned down the power on my left and right flippers to 200.
2) Put 4 (2 on each side) anti airball wedges under the dimension x targets (https://pinside.com/pinball/market/shops/1377-pinball-haven/05733-anti-airball-target-bracket-wedge)
The game already has a lot of dimples on it, probably from all the air the balls are getting. I'm new to pinball so any advice would be helpful?
I'm dealing with this too. I've replaced the target brackets with the ones from swinks . And it has made airballs less common, but after much abuse by being struck by a heavy metal ball, the bracket eventually gets bent back closer to 90 degrees.
The bracket angle can be adjusted with a vice and several whacks with a hammer. Ultimately it's a recurring issue requiring a bit of trial and error to get it to a point where the airballs are minimized... somewhere between a 5 and 7 degree bend seems to work best. But then the abuse (because I'm ALWAYS bricking that ramp shot) makes it bend back and the airballs get worse again.
So I can't say they're gone after I tweak the target, but they do get better for a couple months and then I have to get out the hammer again. Make sure you use something like a protractor to measure the angle of the bracket so you know you've not gone too far with the hammer.
tldr: get the swinks bracket. https://www.shapeways.com/product/GRBNG4DQK/stern-target-bracket-5deg2mm
edit: Seems like the wedges you're using should in theory work just like the angled swinks bracket, but I wonder if a 3D printed piece of plastic would also flex and compress a bit when hit and ultimately not be as effective as a stiff metal bracket?
I have played around with lowering the right side flipper's strength, which helped a little, but this made the game less fun because it made it impossible to backhand the right ramp. And since it didn't eliminate the airballs off that one dimension x target (the one on the right), I cranked it back up.
edit 2; Thinking out loud here, but I wonder if a thick rubber or dense foam face on the target might dampen the hit and prevent airballs by absorbing some of the impact? Clearly the little foam pad directly behind the target ain't cutting it.