Treating the Pinblock with CA Glue
Sometimes the wood surrounding the tuning pins breaks down and the pins no longer can hold the strings to proper tension. This happens to older pianos or those that have spent time in dry conditions. If this were an expensive piano like a Steinway or Bechstein the proper repair would be to restring the piano and use larger tuning pins or replace the pinblock.
This procedure is prohibitively costly for a "non-premium" piano. However there is an affordable alternative that many piano technicians are effectively using to tighten the tuning pins that can prolong the "life" of the piano by 10 years or more.
This alternative involves applying thin CA glue (cyanoacrylate or high quality super glue) along the tuning pin. The glue soaks into the wood and tightens around the tuning pin. The pin can still turn, but there is now enough tension for the piano to stay in tune. It also does no harm to the pinblock so if you wish to restring the piano someday you may be able to use the pinblock.
This process is a half-day procedure and it needs to be done with the windows open and a strong fan running. The fumes are quite strong but they do dissipate quite quickly. It takes a few days for the glue to fully cure and the piano is ready for tuning.
Benefits of treating a piano pinblock with CA glue:
The piano is able to stay in tune
The piano will be able to be tuned to standard pitch – A440
You will be able to keep your piano in working order for many more years
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