EZ, not DZ ...
Much depends on if you can remove the thumbscrew for the sweeps and disassemble it all. If you can, remove the sweeps and take a wire wheel or SS pad / emery cloth to the undersides of them because corrosion lives there and it'll ruin them. Then take advantage of the removal by gently bending them back towards flat so that when reassembled, the sweeps seal nicely against the kettle.
As ash and grease get left in the kettle, it hardens and the sweeps must ride above the gunk in order to turn. This bends them and eventually they won't meet the kettle surface. Poor seal and wasted charcoal after a cook.
If all that went OK, take a wire wheel to the hangar bar and knock off the rust. Maybe some vinegar and baking soda soak, too. You can gently bend it back so that it better supports the ash ring. If it's actually shot, ask zavod44 if he'll make you a new one from aluminum. That's not ideal because it's not as strong as the original steel hangar bar and it's a little thicker, making reassembly a bit more work IMO to get the tightness of the thumbscrew "just right." I tried it and couldn't get it all back together to my satisfaction. YMMV.
OR
If the thumbscrew is seized and pretty much won't move without destruction, BUT the sweeps are still good, leave it ALL alone and move on for now ... securing the ash ring with radiator hose clamps (about 1 1/4" I think).
OR
If the sweeps are tired or won't seal well, get rid of them and don't look back. Cut the bottom nut off if you must. Buy the new 7444 sweeps and use radiator hose clamps to support the ash ring, ditching the troublesome hangar bar for good. It'll be as good or better than new.