Stephen
Have you checked the clutch yet? Seems to me like it is slipping - there must be no grease/oil whatsoever on the clutch; perhaps some ingress of grease/oil has occurred and is causing this problem
If you loosen the large end RA lock nut - the one that you loosen/tighten to suit - you can remove the whole RA axis and see the large nylon clutch disc
I own a G11 however it should work the same for the GM8
Anyway some others with more accurate information might chime in
HTH
Cheers
Bill
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