I'm wondering, since you seemed to have all the broken fins, if JB Weld would have held them.
With the AM tank handles, lube the control levers (I use Fluid Film) and I mod the end of the control lever to get the choke to work. The angle of the choke lever on the AM carbs is slightly different than most OEM. I've drilled a hole and inserted a piece of wire at the correct angle and had it work. I would then glue it in place (JB Weld or PL Premium, etc). Part of the PITA of working with AM stuff.
On the plus side, I like the translucent fuel tanks, and the AM flippy caps don't leak (like most of the AM screw in ones).