<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Thanks for that, Ron. Makes sense. Not to buy a compressor and impact driver.... David. <blockquote type="cite">I think so. And where a driver blade will walk out of a screw slot under constant pressure while you turn it, it doesn't with impact. It seems the blade reseats between impacts. Ron N </blockquote> </body> </html>