Originally Posted by Aeroplane
www.endlessbikes.com has the leg-breaker cog, but you'd probably have to call and ask for it special-like. I think Spicer sells one too.
I checked both places, spicer makes an adapter to use chainrings in the rear and while endless bikes may make what we'r looking for I didn't see it. My Redline Monocog is hurtin to be fixed, especially since I snaped one of the rear brake post bolts this weekend.