anybody have any instructions? Video guide? (wishfull thinking ) Can't find a thing in Google.

Its 35 years old, I've looked after it. Its not been shot much and probably not at all for 20 years. I had it serviced a couple of years after I got it, but nothing since then. Thinking of dusting it off for my lad for shooting in the 10m shed. Would like to know how to replace seals when the inevitable happens. Still holding are at the moment though!