I straightened a bent finder adjuster thumb screw on my Tasco 60mm.
I like to chuck the threads in soft metal lined vise jaws and carefully hammer
with a plastic hammer.
Sometimes these will snap spoiling a perfectly good day, especially the older
chrome plated brass screws. Test with a magnet so you will have a idea on
how much you can get away with.
You just got to say a little prayer and take your chances.