Jack Repair

Today I tuned a piano where one key activated two hammers.

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Upon closer look, I could see that the jack was crooked and positioned a bit under the neighbouring hammer butt.

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90% of the time, this is caused by the jack becoming unglued from the whippen.

I decided to remove the whippen and investigate.

First, I removed the bridle strap.

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Then removed the whippen screw.

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Once I removed the whippen, I saw that it was not an unglued jack, but a slipped jack pin.

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I just used the tip of my screw driver to reinsert the pin and then I replaced the whippen and reattached the bridle strap. Job done.

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If I had looked more closely at the jack with the whippen in the piano, I may have seen the pin sticking out. Then I could have just inserted my screwdriver between the whippen and carefully pushed the pin back in, making sure the jack was aligned under the butt so that the pin had a good chance of lining up with the felt bushing.

There’s a chance of pushing the felt bushing out, but I’ve never had that happen with a vintage piano (<1930). I would be hesitant to try this on a newer piano  (>1960) because typically the felt is a poorer quality

If the jack was unglued, I would have just added a little wood glue, pressed the pieces together, waited a few minutes and reassembled the whippen.

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2 Responses to “Jack Repair”

  1. Cobrun Sells says:

    Would you not replace with a slightly larger pin just in case the pin decides to come out again?

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