I've gone to fit the cush drive assembly on my '58 M21 but the 19T sprocket I want to use has a shoulder on the inside (see first picture) whereas the others 16T and 18T I have do not (see second picture).

Using the 19T sprocket will make getting the retaining nut on difficult as there's a bit of a gap between the end of the shaft and the nut when I offer everything up. I'm also concerned about how the chain will eventually line up with the clutch basket.

Any advice gratefully received.

Gary

email (option): gj.owen@hotmail.co.uk