Whenever I go to an antique store, I'll find at least one box of old wrenches of various sizes. tucked away somewhere. Usually it's on the floor, shoved under a bottom shelf. They'll be made by long forgotten manufacturers and are usually a only buck each. In these boxes can be a treasure of "thin" bladed wrenches. Some can be easily ground down, if not thin enough. Lots of guys I know will never go into an antique store, only flea markets. Over the years, I've found lots of cool bike related odds and ends, out of place; sitting next to glassware or something I could care less about.