Sluggish jack (tight action center) Sluggish jack (weak/broken spring) Negative lost motion Worn hammer butt 'cloth'/leather Hammer return spring too strong Tight key bushing Any combination of above Ken Jankura RPT Fayetteville PA 'There are only three kinds of people, those who can count and those who can't' > What are the top 5 reasons why a jack won't return under the hammer butt > in an upright action? > > =still a novice= > > Brian Doepke > doepkeb@comcast.net > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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