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Eyebrow Patch
Lower ff hole wings crack. It's just a fact. The
problem arises when so few Luthiers employ the correct repair! Most old
instruments have ill fitting, oddly shaped cleats. These cleats inevitably
allow the glued crack to once again fail, and the cleat ends up buzzing and/or
causing further damage to the instrument.
The correct repair is called an eyebrow patch.
Approximately half of the original wood is carved away and a new piece of spruce
with opposing grain is carefully chalk fitted. Once done, this delicate
area is actually stronger than when the instrument left the makers bench.
Additionally, as the patch is flush to the edge, future Luthiers will not get
their opening knife caught up on a protruding cleat preventing future damage
during top off repairs.
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