I was looking for the O ring for a 750 K wire wheel, goes on the snout on the sprocket carrier side.
I took one off a Comstar F wheel, but it had a 1/2 round profile on the o-ring.
Is this part same on F & K model?.. book listed it as 68mm x2.6 mm in the early K book.
Also the F hub, appear to use the same style cush rubbers as a K.. but there are no tits to hold them in place..
.. do they just fall out when you pull off the sprocket?