A10 plunger flinger seal

[chaz]

not having touched the old girl in all the years Ive had her 1952 A10, I started her up yesterday, no oil in the sump, probably as there wasnt much in the oil tank so weight didnt force spring open... now theres a thought for the future...
the motobat still has a good charge and the fuel with octane booster has not gone off. ( the bike has been stood for months ) a couple of good investments there..
I have noticed a puddle of oil on the ramp, seems to be exiting via the oil flinger seal on the back of the clutch. As a plunger virgin, presumably this is a clutch off job or a gearbox out one? also I see the washer is riveted on. Drags dont have a couple of the parts in stock including the rivets. who uses what?