The main frame is removed with 3 screws only. This is much easiler than I thought. Yamaha design is great and it just stands itself on floor.
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Grooves can be seen on most hammer after prolong use. This results in too loud, or too bright a note.
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Close up of the grooves. It was said that longer than 1cm grooves needs "repair". I found mine is ~5mm and is causing too bright a note, comparing with new piano in shops.
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A non destructive way is used to revive the hammer. Traditional way is needling the side and upper/ lower end of grooves/ 1mm under the thickness of hammer +/- sanding / dremel to remove the grooves.
I use a smarter way of steaming and light brushing of the hammer. This can loosen the fiber of the hammer as the steam can deeply penertrate the compacted hammer fiber. This is non destructive and faster than the hot iron method. Remember do not use the copper brush too harsh as it will remove too much fiber.
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The cured hammer puffed up , in comparison with the adjacent grooved hammer. I found a few key are much deeply grooved that the steaming method may not be able to give satisfactory result. Anyway, the piano now sounds more pleasant after partial steaming. I intentionally not have the lowest and highest pitch hammers be steamed, as it was said these notes are less frequently played, and thus less worn.
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Grooves can be seen on most hammer after prolong use. This results in too loud, or too bright a note..JPG)
Close up of the grooves. It was said that longer than 1cm grooves needs "repair". I found mine is ~5mm and is causing too bright a note, comparing with new piano in shops.A non destructive way is used to revive the hammer. Traditional way is needling the side and upper/ lower end of grooves/ 1mm under the thickness of hammer +/- sanding / dremel to remove the grooves.I use a smarter way of steaming and light brushing of the hammer. This can loosen the fiber of the hammer as the steam can deeply penertrate the compacted hammer fiber. This is non destructive and faster than the hot iron method. Remember do not use the copper brush too harsh as it will remove too much fiber.
.JPG)
The cured hammer puffed up , in comparison with the adjacent grooved hammer. I found a few key are much deeply grooved that the steaming method may not be able to give satisfactory result. Anyway, the piano now sounds more pleasant after partial steaming. I intentionally not have the lowest and highest pitch hammers be steamed, as it was said these notes are less frequently played, and thus less worn. 1 hour job and let the hammer dry completely before reinstallation.
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