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Tapping method

There is a tapping method for checking the condition of a rough neck. The ideal situation is if you hold the string down at the 1st fret and the final fret of the tuned guitar, hit the string around the 12th fret and there is a slight gap. If there is a clear gap that can be seen by visual observation, there is a possibility that the neck is warped forward, and if there is no gap at all, it is a reverse warp.

Forward warpage

Forward warpage

A state in which the neck is bent in a bow toward the strings by the tension of the string. If the symptoms are severe, the string height will be abnormally high.

Reverse warpage

Reverse warpage

A state in which the neck bends away from the strings in the opposite direction to forward warp. Sound buzzing occurs at the lower positions.


Adjustment method

If you remove the neck

When actually adjusting the truss rod, loosen the strings and then turn the screw with an allen wrench or screwdriver. At first, turn about a quarter turn and adjust while watching the condition of the neck.
There are types with wrench holes open near the head and types that can be adjusted only by removing the neck, so check the type of guitar you have on hand.

If you remove the neck

If the head has a wrench hole

In the case of forward warp

In the case of forward warp

Tighten the rod clockwise.

In the case of reverse warpage

In the case of reverse warpage

Loosen the rod counterclockwise.


In fact, the neck may be forward warped, reverse warped, entangled, wavy or twisted. You need experience to be able to make an accurate decision, so you cannot force it. If the problem is not solved with a little adjustment, please consult a guitar repair shop.


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