the EAI tool is really sweet, this thing is overkill and i don't want a chainwhip attached to any other tool, especially in a situation where i'd have to grab the greasy chain end to use the other side.

pro racers aside, how many folks here really use a chainwhip or lock ring wrench very often? probably not many (i know, cue 20 people posting about how they switch cogs every day). i work on lots of my friends bikes and do maintenance on my 3 fixies, so i use these things, but still really not more than once a month or so.

i got a nashbar chainwhip for around $6 after a coupon. it's 3/32", but i changed it to 1/8" with some chain scraps i had lying around. if you have the facilities to drill small holes in scrap steel, you can make your own whip easily.

pick up a hozan lockring tool for around $20 and for track nuts at home, i use a generic hardware store 15mm socket on a wratcheting wrench. works great, but it's a bit much to carry on the road. for my bag, i have a 14/15mm socket wrench, as sold by harris. works great for oldschool crank bolts, too.