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One of the causes of tuning instability is the string retainer/ string tree/ string guide over at the headstock. This hardware is installed in this part of the instrument namely because the headstock is not an angled make
ala Fender. Traditional string trees are that of the 'M' type, the one you see undone in the pic above. This design is rather crude & causes snags upon tuning. I've changed my default Smash's string tree to that of the
circular/ roller type to reduce friction hence making tuning more responsive.
Q: Is this the ultimate cure for tuning-related problems?
A: No. This contraption is a mere
enhancement. If your guitar's
nut isn't cut/ slotted well, that should be addressed first.
Q: Can I install this in my guitar?
A: Of course you can but bring along your default string tree to the stores to match it with a replacement of the
same width.