Not sure how many of you have come across this cute little book, but it may answer some questions about the screw, if not the driver... http://www.amazon.com/One-Good-Turn-Natural-Screwdriver/dp/0684867303/re f=sr_1_1?ie=UTF8&s=books&qid=1226498076&sr=8-1 QUINN EVANS | ARCHITECTS Ilene R. Tyler, FAIA, FAPT v 734.663.5888 -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>