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Hi Trevor,
Are you saying that your gearbox output shaft's splines are worn, or splines in the drive sprocket? I suspect that there's always a little movement between the sprocket and shaft.
As far as the locking plate goes they do seem to wear, I'd say if in doubt replace it.
I tend to be a bit paranoid about the sprocket retaining system since the lad that fitted my last rear tyre said 'Your chain's got a real bad tight spot mate' and when I checked it, it was actually that the 2 bolts retaining the sprocket had half unscrewed themselves puushing the front sprocket out of alignment with the rear one.
Now I check those suckers every time I clean the bike.
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