new piano hammers misaligned with the strings: what to do?

If what you say is true (not that I am questioning what you say, but I haven't the slightest idea how much you understand about piano mechanics) you'll have to eat them... It seems obvious to me!

It is extremely important that the hammer strikes all three strings simultaneously. It is hoped that the tips of the misaligned hammers have not become marked... otherwise, when regulated, they could present more than three small grooves. You must demand an immediate inspection. Prevent the surfaces of the tips from being "shaved." Instead, check their tuning after centering.

I thank you for the answers. I am not an expert in piano mechanics, but looking at the hammer raised by the corresponding pressed key, it is noted that the first of the three strings corresponds to the center of the hammer head and the last string is practically on the outer edge of the same hammer. What I don't understand is whether the adjustment can be carried out by the tuner that the seller sends me or if instead an intervention is necessary by an expert technician or by Kawai itself, since the instrument is under warranty.

Provided that the strings have been mounted correctly, if I understood the problem correctly, it is advisable to add paper shims on the hammer capstans to correct their travel so that the hammers strike all 3 strings at the optimal point.

Tuner for Tuscany: http://www.pianoaccordatore.it

A curiosity! Could it be a misadjustment of the left pedal?

Thank you

lorenzo wrote:

A curiosity! Couldn't it be a misregulation of the left pedal?

Thank you

But isn't the piano an upright?

The piano is a grand piano and the hammers affected by the defect are only a small group in the central part.

A Technician must do it, as Pianoaccordatore suggested! But a "good" Technician whom you recognize as competent is sufficient.