Hi Bruno !!!
During my X-5 period, I was thinking about a thrust bearing in each oneway outdrive, plus some Belleville washers in one of the outdrive, and a long screw through all these parts. As for friction function, what about two thin PTFE washer between each outdrive an oneway body ?
This way we can expect to have same friction effect on left and right side
I agree the thickness of thrust bearing + Belleville washers + head screw could be enormous regarding the available space
