Fitted the replacement crank end nut this afternoon and the bike is back together now. Not made any difference to the vibration levels at all as the original nut was solid.
According to the UK importer, the nut spec has been changed from alloy to steel and this will be a mandatory replacement for existing bikes.
As has been mentioned on here before, I believe, the torque spec for the nut in the 2018 workshop manual is incorrect. It is quoted as 40 Nm but should be much higher. I have looked at the equivalent settings for KTM, Beta and Yamaha and have averaged these out at 100 Nm with blue threadlocker.
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