<html> <body> I'll have to admit I've only seriously leveled on an upright, my grand doesn't need it yet, but: <x-tab>        </x-tab>When you put the action stack on, you add another interaction that you needed all along, I think.  That is the capstan to whippen interaction.  These probably have to be regulated.  Possibly some of the capstans are too tight/too loose pushing/or not/ the keys down into the back-rail felt; did some of the hammers lift off of their rest and not others?  Perhaps I'm off on this, but it does seem logical, here while I'm staring at the computer screen. ;-) I'm curious now, please tell me what the solutions was, Andrew Las Cruces, NM At 12:06 PM 1/25/2004 -0500, you wrote: <blockquote type=cite class=cite cite>Greetings list,                  I am doing my very first grand regulation. After carefully measuring the felt punchings thickness, I ordered new ones and replaced both front and balance rail felt punchings because they were shot. I also replaced keytops. The new keytops were .03 thicker than the old ones. I knew from the beginning I would have to compensate in the regulation for the new key heights, and probably some of the residual miscellaneous felt height as well.                  At the job site I put lead weights on the keys' backs and levelled the white keys and then set the key dips on the whites as well. Then, because I am green at this, I removed the the keyframe from it's bed and replaced the stack, screwed it down and when I slid it back in, the keys were all different heights(!) What went wrong? Are the keys supppose to do this. Are my weights too heavy? Must I consider keyweight when leveling keys? rookie, Julia Gottchall, Reading, PA </blockquote></body> </html>