This distinctive heavyweight pressed steel washer retains the Norton pressed steel outer chaincase centrally, in conjunction with the central securing nut (A2/495) which I also hope to offer shortly.
It is item No 15 in the second picture, taken from the 48 Spare Parts Catalog) These washers often get distorted over the years, so that the lip is not able to exert full pressure - which in turn means the chaincase is more likely to leak oil.
This washer, as well as being an exact copy of the original profile, has a distinct lip which should ensure best chance of ensuring a fully retained chaincase.
It is manufactured in stainless steel and polished- so does not rust and looks quite pretty. Price is each