have yall seen this method? according to fixie riders in italy, you can secure a track cog without using a lockring...

http://204.73.203.34/fisso/eng/schpignone.htm

you're basically using the torque of the wheel to tighten the cog to the point where you don't need a lockring... it seems like this might be equivalent to the forces exerted when you backpedal, but i wonder if it would hold up with skidding, or tough use....

experiences? thoughts?