Dan/Chris,
Having not ever seen a X-5 slipper in a state of disassemble before, is it possible to re-drill the centre of the spur to accomodate a bearing. This might help reduce the friction/wear when the spur is 'slipping' against the layshaft.
Just a thought, as it might save the cost of a new spur. I know it's not a job for a dremel, but I'm sure a friendly engineer could do it quick smart.
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