Quoted from slochar:
You get airballs from the lower flippers or the upper left one? The upper left one is supposed to have a resistor to drop its strength way down - and cause a nice burn mark under the playfield. Much better way to reduce its power is to have the end of stroke switch open up WAY earlier.
I don't get the crazy airballs on mine that people see to get necessitating the protector on the plastic behind the flipper. I think ONCE a ball went up there in over 15 years of ownership??
I don’t get air balls in my Seawitch. I get/got air balls on my Robocop and made a deflector as I described for you.
And then I got an aftermarket flipper board for Robo and it has less flipper power and the air balls went away.
So, which flipper is giving you air balls?