<HTML>Bradley Snook writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Every once in a while I come ac= ross a note where something in the action geometry is obviously wrong (e.g. = to get everything else correct, the blow distance would need to be in excess= of 1/8" higher/lower than the rest of the hammer line).   What do I do to fix this pro= blem?</BLOCKQUOTE> The cause is almost always knuckle [roller] placement, as a tiny error has s= uch a huge impact on leverage. If you're going to compromise, almost everyon= e will spot uneven hammer line, even though it is functionally probably not = an issue. More pianists will find differences in letoff and aftertouch than = dip, if you keep it within .010 or maybe a little more. At a certain point y= ou've just got to fix the knuckle. In some cases, though, it isn't the knuckle that's misplaced - it's that the= flange has been placed carelessly on the screw, especially on non-shaped-ra= il types. It can be as simple as moving the flange a little under the screw.= There's often plenty of room in the screw hole. This may disturb the in/out= line of the hammer, but you can decide at that point whether to correct or = ignore that. Bob D  </HTML>