Thanks for the heads up on the sprocket.Checked it this afternoon and was loose. Washer still there. The nut is 9mm wide an nearly goosed threads. For now.until I order the new nut kit, I drilled and tapped the nut from the spanner flats through to the threads for a 4mm grub screw,Drilled a shallow indent,about 1.5mm dp into the shaft for the grub screw to tighten into. Loctited together until new kit arrives but it seems ok so far and will keep my eye on it untill then.
Regards the centre stand there were non standard dog bones to jack up the back end, now back to standard and yokes dropped 5mm.
Thanks again.
Cheers Barrie