I wonder how many times pins could be hammered before pinblock suffer for this action and how much is this action dangerous for the pinblock.
Two days ago the tuner/technician went to my home for tuning/voicing and he hammered the 1st raw of pins in the medium/treble pin section and then he said next time he could do the same thing for the other pins.
What a heartache when he brings the hammer and ...
Thanks for answering.
Luigi

This is a technique for tightening loose tuning pins. An alternative is to replace the pins with larger diameter ones.

The problem with "hammering" pins is that this changes the angle of the string with possibly adverse effect.

There will be no damage to the pinblock in a vertical piano from driving pins in further and no damage in a grand piano, if the pinblock is adequately supported from below with a jack.

By the way, my family is from Casalborgone, also in the province of Torino, near Cinzano.

If your tech hammered a number of pins in a row, there's a pretty good chance that you have a split lamination in your pinblock that affects all those pins. Any kind of repair at this point is just trying to make the pins hold so that the piano can be tuned. The block is already in bad shape, so you don't really need to worry about damaging it further. I've heard some wild stories of repairs that involved soaking epoxy or polyester resin into the block to avoid replacing it. Anyone know if this kind of repair can work? Might be useful on less valuable pianos.

Yeah super glue is commonly used on those, cyanoacrylate, a super fast acrylic resin.
Few weeks ago I saw epoxy poured on a soundboard re-crowning restoration, extremely high quality materials and craftsmanship.

Hello,

There are many posts here which discuss the process of using CA glue. You may want to do a search to check it out. Though superglue is closely related to the stuff they use in pianos, I don't think it is the same stuff.

CA, when referring to glues, stands for cyanoacrylate. Super glue is also CA. A big caveat is that there are many types of CA glue, and the stuff used for pin blocks is usually the thinnest quickest setting type. For some idea of the wide variety of CA glues available check out the Loctite website.