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@johnQdarwin
friction shift is downright dangerous.
like I say ive managed to get 6 cogs running smooth. both the indexing and chainline are factors. and I think that as the shimano 600 mech would of originally been on 126mm spaced frames, it seems to work better with less travel, almost as if the dear sweet old timer just cant stretch like it once did. trying to cope with all these new fangled 130mm frames. the indexing gets sloppy and impossible to get running perfect on either the smallest or largest cogs. so using 6 was easier.
getting a nice chainline is definatly more important than the indexing though. first of , I don't want the chain just coming of the front ring completely. and cos im used to having a perfect (almost) chainline on my fixed bikes, feeling the drivetrain becoming less efficient as the chain travels away from the centre of the cassette, just annoys me.
im enjoying having something to tinker with though.
but also imagining how easier its going to be, to get the bike running even smoother, and a touch lighter maybe. if I chuck some more dollar at it.