Truss Rod dual action 8 3/8" for mandolin and similar short scale stringed instruments.
Apitius Mandolin Co
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FRETS.COM
mandolin truss rod web • the Mandolin Tuner
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FRETS.COM
Mandolin Cafe Forum
Mandola Truss Rod
Mandolin truss rod cover in bronze | Hand engraving, Bronze, Engraved items
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Single Acting Mandolin Truss Rod
Mandolin with no truss rod adjustment nut under the cover. : r/mandolin