Wikipedia has a nice explanation of the different sizes. Here's the link: http://en.wikipedia.org/wiki/Robertson_screwdriver As far as where to find them, I saw some at HomeDepot.com. Michelle Smith Smith Piano Service Bastrop, Texas _____ From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of John Ross Sent: Saturday, January 20, 2007 9:21 PM To: Pianotech List Subject: Re: square drive screws. The largest Robertson I have is a #4, a solid black handle. The yellow is a 0, green is a 1, red is a 2 and 3 is ?. For really large ones, I have used a tuning lever tip wrench. John M. Ross -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070121/a9e1f925/attachment.html
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