My bike is only 2500 miles old and the cush drive looked as bad as yours. I did the Kev mod last weekend, though yesterday was the first test ride.

My view is that rather than excessive wear they just looked (extremely) cheaply moulded and not formed properly in the first instance. I used rubber pond liner, a little bit thicker than inner tube, with a bit of talcum powder, making it a breeze to slip it all back together.

The test ride proved very smooth, and a lot of jerkiness (that I thought may have been a fuelling problem) was evidently the cush drive not originally working as it should.

Great fix Kev - thank you

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www.reeves-cartoons.co.uk
centrestand, handguards and deflectors, scottoiler, handlebar muffs, panniers, cush drive mod, compass, power socket,
petebog rack, handguard extenders, satnav, tank bag...to be continued