In a good many cases, the recommended procedure would be to rebuild the piano. This necessitates in most cases, restringing, and repining with larger pins. However, this is a lengthy and expensive process.
In some cases, the piano isn't worth restoring or rebuilding. This is a decision that must be worked out between the technician, and the piano owner. In some cases, a piano may be deemed not to be worth rebuilding, but due to sentimental reasons, the customer requires that this task is done. But, where this isn't the case, a "quick fix" is the use of a substance called "Pin tightener" In the case where the pin block has become too loose to support a tuning, the wood has dried out around the pin. So, the technician may elect to add a solution of glycerine, and water. This solution causes the pin block to attract moisture and make the pin hold the tuning.
An alternative is to use Cyanoacrylate Glue. This method can also be used to good effect; however, proper ventilation is required when using Cyanoacrylate Glue is used and care must be taken not to get it on the strings. Hopefully, the end result is a tunable instrument. The downside of this procedure is that the pin block or wrest plank can't be used for repining. But, in some cases, it may add a few more years to the life of an old instrument.
Robin Foster MABPT
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