look, it's simple. install cog/lockring and tighten until the muscles in your arms are bulging. use grease. go mash up a hill to add the final touch. back pedal back down, as the cog & lockring are reverse threaded from another and this will tighten the lockring if there's still play in it. when you get home, do a once over with the chainwhip and the spanner to make sure everything is kosher.