might be too late...but edmund scientific has a nifty spanner wrench. it's adjustable and comes with a set of straight, round & bent shank tips, plus 2 center bars that you can adjust the widths of the wrench. the short bar is about three and a half inches in length and the long one is twice that--the working width is about half inch to 7 inches. the tips switch out easily with an allen wrench, and you can vary the length of the arms as well. great set--costs about 60 bucks or so.