See here
http://pinside.com/pinball/forum/topic/finished-putting-new-plastics-on-my-whirlwind-leftover-parts
No one seems to know what this plastic is for.
There is a theory that that plastic attaches behind the top of the playfield to create a barrier between the wires from the backbox and the playfield.
Just a theory Treveism and I chatted about on our way home from MGC.
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