Just picked up a used, but modern, Stern machine that has a feature that tosses the ball forcefully a spot near the pop bumpers. Factory mylar is present, but a previous owner added an adhesive felt disc at the spot where the ball tends to land.
I'd like to remove the adhesive felt disc without risking damage to the mylar around and underneath. Freezing via canned air seems likely to disrupt the mylar. What's a better option? Heat gun? Plastic scraper?