is this Carter BBS fixable?

I saw a guy bolt a side slightly under tension to a flat piece of metal and heat it with a torch. he gently tightened the bolts and got it trued up. then he ran it over a belt sander and got it spot on. you could do the same in a vise on the bowed out top, just cinch it up square against the jaw and heat it up. Zinc melting point is 782F not really that hot when it comes to metals.