Get a Park Tools 18mm cone wrench for $2.00 or a 11/16" wrench for $3.00 in the closout deals at BikeToolsEtc.com. They're decent wrenches for the price, and a good price for something you're going to buy anyway.

http://www.biketoolsetc.com/index.cg...tem_id=PA-CW18

http://www.biketoolsetc.com/index.cg...item_id=PA-CW4