Originally Posted by
prathmann
... slightly worn cogs can frequently be improved by removing the little hook that forms on the back side of each tooth and letting a new chain settle properly on the worn cog rather than hanging up on the hook and then skipping.
i think you nailed it. i filed the backside of the teeth where those little hooks were keeping the chain from moving up to the top of the ring. i added a newer sram chain, and it shifts pretty darn well.
unfortunately for me, i just sold the bike today, making someone very happy.
thanks again.