Vertical sostenuto pedal bar adjustment

If all the dampers have a uniform orientation and a uniform level of wear, the release will be simultaneous. Therefore, check the wear of the felts and the ribbons.

If this is not the case, and only for blatant cases, it is possible to correct the damper wire to remedy it. Obviously, one cannot improvise because it is an operation that can lead to trouble if one is not more than capable. In fact, many technicians gloss over it by saying that "they should never be touched," and it is certainly advisable, especially if you are at a client's house and do not want to risk finishing the job after midnight.

Afterward, the spoons are adjusted, as on all pianos. If the damping delays the release, it is also possible to insert cardboard spacers under the felt, if desired; they have the effect of the screw, which is to raise the felt itself to anticipate the action. Obviously, you cannot anticipate if we are at the wood, and in this case, one acts from above on the wire. Keep in mind that during an actuation in the piano, the felt is usually never glued entirely to the wood, but only at the two ends; this is to avoid annoying noises. This applies to the heels, it applies to the paramallels (in this case, however, it is leather), it applies to the key return cushion, etc.

Thanks Giovanni, always very exhaustive!