<HTML>I regulated a B Friday, and now there are about 3 or 4 notes in the octave just above the break where the jack is hitting the hammer flange on a hard blow.  Upon close inspection, when I bring the wippen up, I can make the top of the jack touch the bottom of the hammer flange on some of the notes, but not on others. I can't seem to figure out why it is doing it. What makes the jack stop it's upward motion when the wippen is pushed up? Wim </HTML>