<html> <body> Hi Marcel,                    The screw and driver is a natural self grip combination, that works better than any self grip driver that I have in my box. Regards Roger. PS Don't break a leg. Just have fun. At 05:43 AM 1/20/2007, you wrote: <blockquote type=cite class=cite cite="">David The square "Robertson" drive is a Canadian invention. That by itself means quality. ;-) Just kidding. But, the main advantages are that you prevent all slipage of the driver. You can also get in the square with your eyes closed. If you have never tried it, you might never use anything else after the trial. One nice place in the piano where I would like it to be used is the damper underlever flanges. The nice thing about it is once you're in the square, you don't have to push to keep the driver in place, you can just torque. Maybe there are more but this is it for this time of day for me. I'll be unsubscribing next Monday cause i'm going on a ski trip for 2 weeks :-)) Hoe you guys behave while I'm gone. Marcel Carey, RPT Sherbrooke, QC > -----Message d'origine----- > De : pianotech-bounces@ptg.org > [<a href="mailto:pianotech-bounces@ptg.org" eudora="autourl"> mailto:pianotech-bounces@ptg.org</a>] De la part de David Ilvedson > Envoyé : 20 janvier 2007 02:29 > À : pianotech@ptg.org > Objet : RE: Panel hauler > > > That's funny...I got their catalog today...what is advantage > of the square drive screws?   I would guess 4 bearing sides...? > > David Ilvedson, RPT > Pacifica, CA  94044 > > ----- Original message ---------------------------------------- > From: "Jon Page" <jonpage@comcast.net> > To: pianotech@ptg.org > Received: 1/19/2007 3:14:25 PM > Subject: Panel hauler > > > >This item might be of some use in the shop... > ><a href="http://www.mcfeelys.com/e/EO07A17.asp?id=1915478" eudora="autourl"> http://www.mcfeelys.com/e/EO07A17.asp?id=1915478</a> > >-- > > >Regards, > > >Jon Page > </blockquote></body> </html>