Is it common for the older BMC's to have the steel ring slip inside the alum cover plate?
I tried to get the cassette off a a year or so ago, I still have not fixed mine yet.
The last few days I thought about brazing it, a quick look cant find no alumi-steel brazing rod, they got al-steel welding rod though, I got no welder
I could rent a welder for $10/hr, but I have never welded before. I could probably find a friend of a friend of a friend who is a welder. ebikes, sff, em3ev have plates but dunno if they would fit, plus they are expensive.
I may try to drill dowel holes between the two metals, then use steel epoxy.
I just thought of something, drilling steel bolts into the alum cover, then brazing steel.