I recently purchased a Trinity College TM-325 octave mandolin. I have a buzz on the third string(D strings)when fretted. I tried to put a bit of relief in the neck by adjusting the truss rod, but loosening (turning left) or tightening the truss rod appears to make ZERO difference in the action. I capoed at the first fret and depressed the 21st fret and a credit card placed beneath the string at the 7th fret rubs the fret and string firmly, so much so that it is tight to squeeze between. Since the bridge is of the non-adjustable variety I am wondering if any of you knowledgeable members may have an idea how to raise the action. Is there an adjustable bridge I can purchase for a Trinity College octave mandolin? Any help would be greatly appreciated. The instrument has a really nice tone and sustain but the buzzing is killing my enjoyment. Thanks!!
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