I do really apreciate your help steve but I didn't make the last post as a desperate bid for help with my problem even though it would be great.

I thought it best to tell the true problem with the nsr cranks as everybody sort of forgets this. Eventually all model of NSR's will have the same problem when stock dries up for the later bikes. This crankpin issue is what we should be worrying about sooner rather than later. (mines a 5K but with a 2j motor)