Thanks everyone for your detailed input - a bit more learning for me.
Still trying to locate a 'surplus' worn rear sprocket - Bunny doesn't have his any more.
Anybody else had one changed recently?
By the way - love your photos Calum (RedThree), fantastic car & scenery.

Thanks
Andrew

M3W
986 3.2S
Frogeye
Midget 1275
BMW i3S
Tesla Y
New Ionic 5N
BMW R12 Nine T
BMW K1300S
Jet 200