A mid-sized Philipps screw driver (one where the "head" part isn't larger than the shaft) works as well. If your tool is a bit smaller than the hole, no big deal. The torque shouldn't be high - no need to crank this down.
Or get a piece of steel rod at a hardware store.
--
Jan Heine, Seattle
Editor/Publisher
Vintage Bicycle Quarterly
c/o Il Vecchio Bicycles
140 Lakeside Ave, Ste. C
Seattle WA 98122
http://www.mindspring.com/