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@number6
hugo7 - check the links above they should explain it pretty much,. basically all the excess space in freehub is filled with a metal epoxy jamming and sticking it up tight (be patient before riding - it takes a day or so to harden )
s3x cogs are just cogs for the s3x hub - single speed cogs that fit a shimano spline - see
''Single Cassette Sprockets and Spacers''
at http://www.sheldonbrown.com/harris/singlespeed.html#s3xcog
nothing more special than single speed cogs for shimano free hubs really
even the cogs off a cassette will work (but i didn't have the right sizes here )- single speed cogs are better as designed to keep chain on more. spacers and 12t cog came from a single speed kit - plus 2 more cogs in there too .