From your pic it would appear something is there. If you're leaning towards replacing the drum anyway, put it in the lathe and see if you can dig it out. You may be able to clean it up easier than you think. You also might lean towards doing this after you find out how much a new housing is.
I don't think machines built in England were any different in this area.
Re: 7710 pto clutch wear in reply to Bern, 01-27-2013 06:12:39
Three seal rings. I looked it over again until I found what looked like the ring gap. Took a tiny punch and got the ring to move. Running against the support has rolled a burr in on top of the ring. I agree that it can likely be polished. Will price out parts and see. Clutch discs look good. Center bushing looks a little rough.
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