because of the long necks and high tension, it is a good idea to have a truss rod in these instruments.
I've seen some debate among builders re: the relative merits of two-way vs. one-way truss rod, but not a clear consensus in favor of one or the other. As I understand it, it is extremely rare for a neck to bow backwards, given the force of the strings. The one-way and two-way rods are really just different mechanisms for adjusting in relationship to the pressure to bow concave.
Karen Escovitz
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Otter OM #1
Brian Dean OM #32
Old Wave Mandola #372
Phoenix Neoclassical #256
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If you're gonna walk on thin ice, you might as well dance!
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