I dunno about power tools on a playfield. This has been mentioned before. I just can't bring myself to do it.

When you use your hands, you can "feel" the playfield and what's going on underneath.

Mylar removal is a "case by case" decision. I've sweated over a few and even had a few coldies beforehand to muster the courage !

I KNEW someone would make the power tools comment! It does just seem risky, doesn't it.