im_alan_partridge said:
Thats one nice mono, but that handle looks like some one sat on it with a burning hot arse
Nowt worse than that burning ring of fire...
Don't try to straighten it in situ, that risks breaking the captives at either end of the cabinet.
Suggestion one:
Remove it gently, slacken off the fittings one thread at a time to avoid stressing the cabinet then clamp the handle between two bits of solid hardwood in a vice and tighten away as far as the wood will let you. if that leaves some bow on it, then you might need to peel off the sleeve and apply heat to the core of the handle to get it completely straight. Take it only as far as cherry red if you do that, or it'll end up either too soft or too brittle to be of any practical use.
Suggestion two:
Ask on the world's premier boombox forum whether anyone has a suitable spare handle that hasn't been used as a perch by the world's fattest parrot, remove the old one as above and fit the new one. I think I'd prefer that way than trying to take a bend out of some thick walled HT tube.