Originally Posted by Gaz-b
My two new sprockets arrived today and they have changed the pattern slightly but still drop right in. The one with the red spacer has had four packs and the other brass one has had two packs. The spacer is no longer needed as the built in one is the correct length. I dremeled a flat onto the shaft at 15mm from the end so there is a radius rather than a filed flat as the square edges would create a stress point. I fitted it with a little stud lock on the shaft and used nut lock on the screw with a bearing and clip on for spacing then remove the bearing asap or the stud lock will want to keep it. I tested the new sprocket with a file and it didn't touch it.
From the pictures it seems the radius of the steel sprocket is smaller hence the chain bushings won't rest on it, possibly?