My fan belt broke (again). It occurs to me that I should probably carry a set of tools in the boot. To deal with any reasonable eventuality, what tools -- and what sizes -- should I have in my kit? I'm thinking two or three sizes each of straight-blade and Philips screwdrivers, a set of combination open/box-end wrenches, two sizes of crescent wrench, and a pry bar. Of course there will also be the brass/rawhide hammer Anything else? And what sizes on the wrenches?