I think you’ve got the problem Herman.
My Gardiners swivel works very well and at a price I’m happy with.
You’ll probably say the pivot point is too far away too.
They will all wear eventually due to friction but can’t say I’ve found it to be much of a problem.
I would hazard a guess you don’t use or own any of them either?
So, they all share the same problem which is you didn’t invent any of them.