sprocket and stuff

[coffee]

I do get the damage that would arise if t his nut came adrift but I don't know if the 600 is the same but the locking washer locates on the shaft like the sprocket itself then is knocked over as usual ,once tightened I would have thought it very unlikely to be able to work loose without the tabs on the washer breaking ( both of them) and this in itself is pretty unlikely. I'll certainly keep an eye on it though. :thumbup