Hi Mike,
Working from memory???
The cush hub will fit straight in place
I think you need the thick washer and nut with sticky out lip to go with it..
No tab washer used, add a drop of thread lock fluid..
If you fit a belt drive kit to the A10, you will lose the cush feature ? Unless you fit one of Tony Haywards Triumph based kits that retain the cush clutch hub...
Alternatively get SRM to convert a crank cush drive to belt pulley
John