It still works okay? Should I fix or leave it? How would I straighten it back?
I've used my hydraulic press and V blocks to straighten tubing. It's a bit tedious, but generally comes out great. The hurricane bent my flagpole and it's near perfect now. I also straightened the heavy barrel of a target 22 Mossburg 144LSB. It purchased it used for $50 at the local store, not noticing the bend. The results have been spectacular! Very accurate!
The internals of a trimmer won't much care if there is a slight imperfection in the tubing.