so take off the freewheel, replace with a singlespeed cog freewheel, then use a BB lockring to lock the cog down and then use locktight on the threads? i've worked with bb's before but which part is the lockring and how can it be used to lock down the freewheel? do you mean the lockring that is on my current freewheel right now? the one that comes off with a bb tool? and how does that make the setup a fixed gear? wont it still be able to backpedal? maybe i'll understand it better when i take everything apart in person.

also sheldon brown's site mentioned re-dishing? is it necessary?