Just had the rear wheel off my 78 mini 1000 project to swap nasty wide alloys over to nice proper dunlop d1's, noticed a problem while gazing at the suspension set up....... Its sitting a tad low at this corner which up to now I've put down to a bad suspension knuckle but....
At the back of the subframe where the rubber suspension cone meets the subframe, it is half encased in a steel cup, that looks to be located in the suspension cone mount (hope that makes sense, this is the very back of the set up, not the trumpet end)
Said "cup" is rusty thin, splitting away from cone and not enscapsulating (big word

Just like to know what I'm looking at before I drop the suspension to fix it, thought I was nearly done but this little mini is like the forth bridge.