Just today the tuner came to perform maintenance on the piano, a Kawai upright. While checking the tuning of the keys by pressing them, he broke a hammer, specifically the E3 of the piano. The hammer shank (let's say the wooden stem of the hammer) snapped, and he fixed it with super glue (Attack), passed a lighter flame over it to make the glue set first, and then tied the two broken parts together with twine before applying more glue and using the lighter flame again. He said that in this way, the E3 is now more resistant than the other hammers (at least that's what he says).
I am asking someone who might be an expert if the tuner's method of operation was correct or if there is a possibility that the hammer will break again in the future and therefore he has caused me significant damage.... another doubt.... is it true that that hammer is more resistant than the others as he said???
Good grief! Either the wood was rotten or your tuner has a 20kg hammer instead of a finger, one of those blacksmiths use...
Anyway, replacing a pin doesn't seem like an insurmountable problem to me.. Fixing it with the attack, in my opinion, sounds like a real botch job. Physically speaking, I really don't see how a compact body that, having to strike the strings at high speed, also goes into vibration itself, is any worse than the same body sectioned into two parts glued together with a component that, among other things, does not facilitate vibration because it is extremely rigid and easily fragmentable in case of vibrations. In my opinion, it will snap off after a few heavy strikes. Let's wait for the experts' opinions, but I still continue to have my doubts.
La colla cianoacrilica indurisce i materiali su cui è depositata facendo perdere l'elasticità.
La porzione di legno o di pelle incollata diventa dura come se fosse "vetrosa" e si spezzerà in seguito.
Si faceva prima ad estrarre il martello con l'estrattore e cambiare lo stiletto.
P
Pianoaccordatore
Reply 5 by Pianoaccordatore
If the mechanism is sound, I honestly don't understand how it managed to break a stiletto.
That said, hammer stilettos usually break near the center. If they are repairable, aliphatic resin glue must be applied, the parts aligned and pressed together. Then remove the excess glue and wrap the joint with heavy carpet twine.
You can remove the twine and sand the stiletto after the glue has dried.
I wouldn't have used Attack to reassemble the two wooden stumps, for the reasons already mentioned, but I am not a technician (I would have used wood glue..)
Let's say I am in favor of replacing the striker. It doesn't take much. This way it resists well, but the look is terrible. Let's also say that the striker, at the moment of impact, flexes, affecting the final result: the sound. Thus it results in being much more rigid....but nuances....Anyway, it doesn't cost much to change it....we mean almost for free?
Having some experience in harpsichord building, I believe that they effectively should have used aliphatic glue which, if applied well (not in excess and without leaving empty spaces), creates a molecular fusion between the wood parts without altering the vibration.
Anyway, how much could it possibly cost to change the plectrum? At most, get them to do another couple of tunings for free... (without breaking the strings, though!).
