I am looking for some guidance on how to fix this crack. It is a on a Martin Sigma Classical CS-6 ('70s era) that I picked up for $20 at a garage sale. I've done minor repairs on instruments before, and don't think I need a pro on this. My first inclination is to fill with CA glue and sand it even, but maybe you-all have better idea. It is a nylon-string, so not a lot of tension on the neck. Neck is straight.
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