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Good tip, thanks I'll be careful !
Spoke to Mercian who were extremely helpful. My understanding from what they said was that there were actually 2 versions of generation 2 (round top) shape ergo levers in 9 speed, the first few years had a slightly different ratchet in them (EC-RE313) that was specifically designed for the matching 9 speed derailleurs. Once 10 speed came in around 2001-2002, the still current 9 speeds got a new ratchet (EC-RE063) that seems to be more compatible with 10 speed derailleurs. At this time Daytona up to Record ergos were offered in both 9 & 10 speed, though 9 speed Veloce and below retained the old ratchet for a year or 2 for some reason.
You can see the 2 part codes in the tech docs. Both work with 10 speed but the earlier ones do not quite work quite as well which may account for the issues. I'm using 10 speed derailleurs so if I have the old ratchet this may account for the sifting being slightly iffy. I think Mercian said the older ratchets have '1' stamped on them so I'll be able to see when I open them up.
Yet another confusing Campagnolo issue!
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zootsuit
@Scilly.Suffolk
The 8 speed Chorus I serviced had a left-hand threaded screw holding everything together (the first one you see when you open the back up).
If memory serves, it was stamped "L".
Off course I don't know if it's the same with yours...