I've picked up an early '70s solid-wood Yamaki F-150 acoustic in auction, with a back-bowed neck. The truss-rod adjustment is an allen-head screw just inside the sound-hole, but it is hardly moving and I'm guessing it's rusted up. I'm reluctant to risk damage by trying to unscrew it, considering that unless it is double-acting, it won't help. Without major effort I can bend the neck into an acceptable relief.
Should I persevere with the trussrod (is it likely to be double acting?) or try clamping the neck to a 4x2 from behind with some blocks and some gentle heat? Any suggestions welcome!
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