<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2668" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hi Matthew,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>As you say, checking height changes when varying the force of the pressure on the keys.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>That is why you have to be careful to put the same amount of force on each key, and that is also important when regulating key dip, because if you do not press all the keys the same way, you will not have an accurate regulation, and key dip is very important for backcheck regulation.</FONT></DIV> <DIV><FONT face=Arial size=2>You can help that with the installation of firmer front punchings, like the Crescendo white punchings.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>For me, the best way to regulate backchecks (on a grand), is to make a well regulated sample in each section(15mm from the strings is the Yamaha standard, for example), and then with the action on your knees, align the adjacent hammers with that sample, and so on.</FONT></DIV> <DIV><FONT face=Arial size=2>You have to bend the backcheck wire with your fingers a little bit, be careful because sometime you don't have to move the wire too much to get a big difference.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>At the end, if your backcheck regulation is fine, you will have a straight line with your hammers in checking position.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I hope this helps,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Quentin</FONT></DIV></BODY></HTML>