A tool tip for beginners and old hands as well, is when taking out old screws (or anything threaded) that have not been unscrewed for a long time, remember to reverse the direction of the screw after a few turns coming out, screw it back in just a bit, and then reverse the direction again to continue removing the screw. I do this more than once on longer-winded screws or threaded fittings like presser foot adjusters.
Reversing the direction of rotation once in a while during removal will help shed the debris that gets trapped in the threads of a dirty bolt or screw, and help avoid forcing the debris deeper into the threads. It’s sometimes hard to remember, but when you feel the screw or bolt begin to tighten up, screw it back in a little bit and then go back to unscrewing it.
I just thought of that tip while I was screwing around.......
CD in Oklahoma