Quoted from Psw757:
Not sure if the plastic above the 1964 targets was designed to mitigate air balls but it does project out over the drops and if it wasn’t there I would imagine airballs would be created at this location as well.
Take a look at a good picture and you will see the clear plastic that runs from left of Ringo target near flasher all the way across, the whole thing including art is one piece and covers the targets completely.
This pin is hard to find pics for. I did find this but it looks look a home made job sitting on top of the factory art. I do have a Seawitch and air balls are no problem on that pin. And I can see where a new more powerful pin like Beatles would have an issue with air balls in mid-play field, like my Robocop I made a deflector for, b am having a hard time understanding how air balls would be a problem up in the back so far from the flippers.
I don't what kind of material Stern is using to make these new plastics, the the stuff of old will break. If the center piece is unbreakable then one piece would be fine, but if it can break you will be glad the deflector is a separate piece.
And i have to agree that an additional piece is cheaper for Stern instead of having to retool.