Dear Geoff,
Many thanks for your invaluable advice. Found that my machine did not have a screw with locking wire over the slot. But a spring clip with a pin that would locate the sprocket bush. The flat spring clip goes about two thirds around the sprocket hub. Still have a problem though because the clip appears twisted and no matter what I did I could not get it to clear the bearing housing. Have made a special tool, a piece of steel with a slot in it the same size as the hub to slide in between the bearing housing and the clip. So the clip should straighten enough so I can push it off the hub. There is very little clearance between the housing face and the clip, so made the tool out of the thinnest steel plate I could find. A paint tin lid. But think it will not be strong enough, but have not tried it yet. Will give an update as to how I get on.
The continuous rain has put back any chance of ploughing though. Am like a lot around here with ground that needs working, but its too wet. Am concerned the shaft is twisted and if so, am not sure I can straighten it.
Best wishes,
Grahame
