Microshift b-stop tab not mating with hanger stop tab??

Old Marin frame (1999) and the tab on the hanger looks a touch smaller than others but the microshift stop tab hing only just catches it and it won’t last long… Solutions? Will attach pic as I don’t think I described it v well.

Photos: https://photos.app.goo.gl/2jTuQXQnJJ8P2p2f7

It looks like the stop tab on the derailleur isn’t bent round enough.

It’s a ball-ache, but you can put the bolt in the wrong way up so that the wider head engages more of the tab.

It’s not ideal because it makes it a PITA to set the b-tension, but you should only need to do that once in any case…?

The b screw hits the tab on the derailleur OK. It’s the derailleur tab that only just connects with the nub on the hanger, pretty sure it will wear it through quite quick.