Problems and Disadvantages
Using tacks on a piano runs the risk that the tacks will be ejected from the hammers and can then become lodged in other parts of the mechanism. If the jammed mechanism is then forced by hitting the keys, parts of the action may be broken. Most importantly, the holes created in the hammers by the tacks act like a poor job of voicing, and may permanently reduce the sound of the piano to dark mush once the tacks are removed.
A safer alternative to real tacks is a device called a mandolin rail. It is a curtain of felt hanging between the hammers and strings. The felt is slitted on the edge, and paper fasteners or paper clips attached. The device can be purchased commercially or built by hand, and ultimately causes the piano hammers to be worn away from repeated impacts with hard metal. Mandolin rails could regularly be found in home pianos at the turn of the century, but were most popular in commercial coin-operated pianos.
Read more about this topic: Tack Piano
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