Originally Posted by
himespau
Sheldon said people should have two of each type of cone wrench. Is the second one he's referring to the 17 mm box wrench you're mentioning?
Remember, Sheldon is expecting to work on a wide variety of hubs and, therefore, needs a complete set of cone wrenches.
Cone wrenches are very thin to fit the narrow flats between the cone and the locknut and some hubs need two of the same size since the locknut also has very thin wrench flats. I have a set of 7700-series Dura Ace hubs and they need two cone wrenches since the locknuts are thin and flanged so a regular box wrench won't work. The rear hub requires two 14 mm cone wrenches as both the cone and the locknut have the same size flats.
You have one specific hub set to deal with and the locknuts on them are very ordinary looking hex nuts and easily accesable to any regular open end or box 17 mm wrench.