If you don't fancy cutting down the bottom bracket and rethreading it, there is always this trick

http://www.bikeforums.net/showthread...=1#post6577540

I did it on my Moulton MK3 (same 26TPI threading as the R20).





The beauty of the solution is it does not change the frame or the threading in it at all.

Full picture set with my slightly modified version of the procedure on my flickr set here

I have two S2C hubs and so far they seem very nice.

Jerry