Originally Posted by peripatetic

Actually, I just did this yesterday. Couldn't get the chain whip to work, maybe since I had a larger (16T) cog, so I used the suggestion in here (check out the actual photo, too):

http://www.bikeschool.com/technical-board/messages/9489.htm

It worked like a charm. BUT JUST MAKE SURE THAT YOU TURN THE WHEEL IN THE RIGHT DIRECTION--I had the bike flipped and ended up tightening the cog onto the hub so hard that I fragged up the cog's threading. Make sure that you turn the wheel forward (clockwise), as it says in the directions.

The chain whip definitely helped with tightening the cog, though.