<html> <body> Except Jon says that only a few of them feel that way. In fact, the question he asks is too general to be able to offer a "cure".  If he had a particular piano in front of him, he could try any number of steps. -Check jack position under knuckle.  -Shape and or position of particular knuckle.  Sometimes they're not consistently alligned.  (New or worn?) -Friction at action centers - jack, wippen, shank, damper lever. -Timing of jack / rep. lever contact. -Clearance of knuckle by jack -Rep. lever height -Strength of rep spring -Damper timing and stop rail clearance But will we ever know? David Skolnik At 05:23 PM 11/4/2006, you wrote: <blockquote type=cite class=cite cite="">Jon, When you say spongy, I'm led to think that the front rail punchings are what you're talking about. Try a set of Wurzen felt punchings (<a href="http://www.pianofortesupply.com/"> http://www.pianofortesupply.com/</a>) and see if that helps. Key dip is typically 10 mm, a bit more than 3/8". Aftertouch might be a little less than 1/8" (of key dip); check for the jacks clearing the knuckles by a 1/32". Tom Cole J W Stein wrote: <blockquote type=cite class=cite cite="">Hi Folks,     Here is a question regarding regulation of aftertouch when depressing keys.  When regulation actions, I like to break key movement into eighths.  I figure that most normal key depths are 3/8 inches.  Thus, the first 2/8 of movement is smooth..then there is that last 1/8 if aftertouch.  I like to feel the slight hesistion (clicking feel).  However, there are times when that aftertouch feels too spongy regardless of what I do....jack regulations, drop, let off, etc....   About the only thing that seems to help is a slight increase of depth....but why would most keys have the "normal" feel of aftertouch, while a few are unresponsive...?????     Any ideas?   Jon  </blockquote></blockquote></body> </html>