My Lodge pan sat unevenly on the flat cooktop. I realized it wasn't warped, just the Lodge logo in the center was slightly higher than the rest of the pan bottom. I used a steel file to take off a bit and now it sits flat.
You used a file? By hand? Dude, belt sander!
Don't own one. It only took a few minutes anyway.
Wait, you don't keep one in the oddments drawer in your kitchen along with spatulas, skewers, and the rolling pin?
I own an electric drill (and regret breaking my manual one), a circular sander, and a soldering iron. No other power tools. Oh, and a chainsaw. Pretty much do everything with hand power. Even my lawn mower is a reel mower. I'd love to have a fully furnished shop but hate spending money.