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Shown with washer on the inside which may work better. You will then need another nut on the outside to hold the tensioner on. Shown held up in stock position. Regards Jerry

Single speed tensioner with anti rotation washer and non flanged nut. Almost fits. No way with the flanged nut Regards Jerry

Ok I had my rear Brompton wheel off anyway so I have done some pictures to show it more clearly using my Tongxin as a substitute. Man I am so kind :p Bare with me whilst I post them. Shown my Tongxin held up to the rear droputs. Notice the flats and how they fit in the dropout. Anti...

This shows how it works. Regards Jerry

cwah, If you look at the shaft it should have to flat edges on it. Usually they are 10mm across but the other rounded sides are 12mm diam. The flats, slot into the square section dropouts to help prevent it rotating. Of course in many cases a torque arm/plate is required for anything other than...

Is that 10mm across the flats or the shaft diameter ? Regards Jerry

I have just checked my single speed tensioner and the shaft is not the problem (assuming it is 12mm) as the hole is big enough. The challenge is the cutout for the larger nut. The flange nut will have to be changed for a non flanged nut. The recess will have to be opened out and then its going...