I had my LBS order me up a Dura Ace lockring, a Parktool lockring wrench, and yes I always liberally grease up my threads with Philwood grease.

Diapereater: So you build up a rear wheel using a road rim and a front hub made for disc brakes? How in the world do you measure and drill the holes in the cog? If they were off by even .1 of a millimeter your chain tightness would be ackward. Are you just using cogs made for free hubs? Pics?