<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF"> Marcel, This is what I understand happens.  If the weight distribution on the four casters is different after the move, it can have a very noticeable effect on the tuning, as you noticed.  This is why I try to avoid moving a vertical piano after tuning it. Regards, Clyde Hollinger Marcel Carey wrote: <blockquote TYPE=CITE><style></style> Hi,This morning as I was tuning two U1s in a practice room at the university, I used RCT for the first one and tuned the other one aurally. To compare afterwards, I moved the first piano so the two keyboards would be perpendicular to each other. To my surprise, the piano that I moved was flat (this is the one I did with RCT). So, I took some readings. In the new position,A3= -3.4¢. I returned the piano to it's original position and A3 went right back to 0¢....I never thought there could be so much difference just by moving the thing around.So, beware, Marcel CareyMarcel Carey, accordeur technicien (819) 564-0447 <a href="mailto:mcpiano@globetrotter.net">mcpiano@globetrotter.net</a></blockquote> </body> </html>