Answer to Knocking Puzzler

[Mike Kurta]

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    Hi Guys:
    Alan, Conrad and John, all good guesses, but no cigars.  Tom, 1st =
prize for the funniest.  David, you got it!  The refinisher removed the =
felt from the backside of the key blocks which would normally limit the =
fallboard position when open.  With the felt gone, the fall tipped back =
too far, bringing the lower end forward creating interference with the =
sharps.  Good going!
    Mike Kurta
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