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These adjusters are made with genuine first quality ebony threaded rod for superb sound transfer. The adjusting wheel is a light -weight synthetic. These adjusters are a direct replacement for Robertson ebony and phenolic adjusters - the unthreaded end fits into a letter Q hole.
Please follow installation instructions for best results. You'll also need a letter Q and letter U drills as well as a 7/16 - 14 tap.
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