Diagnosing noisy una corda pedal - 08/14/20 09:53 PM
Piano in question is a 1961 Steinway B. The soft pedal on the piano makes a fairly loud creaking/groaning sound as the pressure on the pedal is relieved. It is really audible as the pedal is disengaged as opposed to when first depressed. I have tried dry lubricant on the the key frame/bed with minimal improvement. If I turn the glide bolts down any further, the key tops rub on the bottom of the fallboard and have already begun to scrape the felt away. With the action removed, the pedal seems to operate fine (no noise). Just a guess but it seems to me the keyframe is flexing or rubbing as it slides back into home position. Since i've owned the piano, the soft pedal has always been a lot stiffer than I would like ideally. I'm an amateur tech/tuner and kind of at a loss on how I should proceed.