Found Inside Our Whirlwind

As we cleaned out this 1990 Williams Whirlwind for a full shop job, we found some old paperwork inside.

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This is a factory letter explaining why there was no Mylar on the playfield, and a piece to install yourself. No one paid attention to this, it would seem.
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We tucked this stuff back inside the game when it left us. It seemed the right place for it to be.