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what was cool was that the chaincase has little brushes in, which i presume keep the chain fairly clean. the whole drivetrain's in remarkably good nick, but as I was changing the cables, i thought a new chain would be a reasonable idea, and while i'm at it i MIGHT get a new sprocket, but costs...
also, disconnecting cables from roller brakes and hub gears is a new fun experience for me!
fizzy.bleach
Ha, I don't think I ever opened up the chaincase all the way - I'd not seen the chainring was a bit ratty. OTOH, in the chaincase's favour, it allows riding in all kinds of clothes without worrying about chain muck, and - unless you've changed it - that's still the original chain on there. For something that's done at least five thousand miles in all weathers with only the odd (couple of times a year?) addition of chain lube, that's looking pretty good.
The Nexus shifter is ok - I slightly prefer the rapidfire action, but finding one suitable for a Nexus was a faff and I gave up. The only thing to beware of is that (like STIs) the cable will eventually fray at the shifter end, and if it frays enough it's a pain to remove. You should start to feel it go, and it's a fairly slow process, so it's not like you don't get fair warning.