My Dad's bought from new. I know from the Webley site that these were made 1947-71, so it must need a new washer by now! Surely?

Does anyone have a better suggestion for a replacement washer than:
http://www.airgunspares.com/store/ca...EY/Webley-Mk3/

They show a leather washer for £15, but does anyone make anything more modern and durable than just 'leather' for this gun?
I realise its not a modern air gun in performance terms, but it would be great to make it as good as it can be.

cheers
R