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truss rod u channel

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The U-channel seems to refer to a non-adjustable rod.

A Gibson style rod needs a longitudinally curved channel. Deeper in the middle than the ends. It is then covered with a corresponding strip of wood which will force the rod into the curve of the channel. The fret board is then glued over the whole thing. Tightening the nut on the rod will try to straighten the rod and hence generate a force against the pull of the strings.

It's the same principal Structural Engineers use for pre-stressed concrete beams!


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