This looks to be a pretty good guide for mk2 shifters, not sure how applicable it is to mk 1, need to look at the exploded diagrams ...
http://www.cyclecycle.info/campagnolo-ergo-shifter-assembly
Looks good for first generation Ergo too: the business card trick is very neat!
@Scilly.Suffolk started
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This looks to be a pretty good guide for mk2 shifters, not sure how applicable it is to mk 1, need to look at the exploded diagrams ...
http://www.cyclecycle.info/campagnolo-ergo-shifter-assembly