Ugly. That non-adhesive mylar was a brilliant idea Gottlieb... not.
If one of the metal guards breaks, no worries! Just screw two giant screws into the playfield! Oh, and don't you worry about drilling a pilot hole or anything... just screw those suckers right in there.
Again, this is what non-adhesive mylar does to a playfield that isn't regularly cleaned. Dirt gets under the mylar and then it just acts as sandpaper every time the ball rolls over it. Terrible idea.
Nasty nasty nasty... and oh joy! Rust!