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Are you wondering about #2 in this diagram?
https://www.realoem.com/bmw/enUS/showparts?id=0469-USA-03-1994-2478-BMW-R_100_RT&diagId=31_0371
The nut should be 41mm and is typically thin so there's not much to grab on to. The "tool" to get this off is a 41mm socket, preferably a 6-sided one, with the leading edge milled down. The milling gets rid of the inside chamfer of the socket so it can have full engagement on the nut.
I don't find a whole lot written about it in my Haynes. But from the diagrams that we've shown, it appears that nut #2 threads onto the top part of #7 and sandwiches the upper fork between the nut and the flanges of #7. There's an o-ring (#8) that probably fits into the bottom groove on #7. From the diagrams, it just appears that #7 lifts out, working against the fit of the o-ring. Probably on the underside of #7, it's hollowed out enough to accept the spring that fits inside. I guess that's why it's called a spring retainer.
Never been inside one of these later forks, but that's what it looks like from the diagrams.
Thanks, Lee. That's certainly an odd arrangement...
But with the monos, they decided to take the Crazy Train.