Found Inside Our Whirlwind

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

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.
We tucked this stuff back inside the game when it left us. It seemed the right place for it to be.