I decided to strip and service my Eno last night after 2 years of muddy wet riding. Well I was really impressed with the quality of the internals, all that's needed is a pin spanner to spin off the outer metal seal, pop off the big circlip and pull out the toothed rachet outer, leaving the centre with the pawls. Cleaned and de-greased all the bearings and internals, regreased it all and put the seals back in, rebuilt and now it sounds like new. Hopefully it'll last like that for another 2 years before another service, I may even treat it to a new sealed bearing then....