Can't remove lockring Have been trying to get the lockring removed from my cassette so I can replace it with a spacer kit and one sprocket (singlespeed conversion). I managed to get it loose, although the wrong way - so the whole cassette started unscrewing off the hub. I can't turn it the other way at all. Can someone confirm:


That this is actually a lockring
If so, any tips on how to remove it?


I have a chain whip, lockring tool and 24mm spanner/wrench.
If it screws on then it is a freewheel not a cassette.  They are not the same.  There is a link in my comment.  

Your spacer kit with one sprocket was probably for cassette / freehub.  It is not going to work.

I suspect you can find a freewheel single speed conversion.
You need a single speed freewheel - not a sprocket and a lockring.