Originally Posted by
jakerock
CRAP... Maybe its from skidding when the lockring isnt tight enough initially?
...That little bit of high torque back spin from the cog is enought to strip the lockring a little? Crap. Im gonna have to buy a new wheel tomorrow.
That's most likely what happened.
Try
this method for tightening the cog, works much more effectively than jumping on the pedals.