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tapping method

There is tapping method to check the condition of a rough neck. This is an ideal situation if you hold the 1st fret of the tuned bass and the final fret, hit around the 12th fret, and there is a slight gap. If there is a clear gap that can be seen visually, 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 caused by the tension of the strings. If the symptoms are severe, the string height will be abnormally high.

Reverse warpage

Reverse warpage

A state in which the neck bends in the opposite direction away from the strings. Note buzzing occurs at the lower positions.


Adjustment method

When actually adjusting the truss rod, loosen the strings and then turn the truss rod with an Allen wrench or screwdriver. At first, turn about a quarter turn and adjust while checking the condition.
There are types with wrench holes open near the head and types to adjust by removing the neck, so check the type of bass you have on hand.

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, it 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 the truss rod. If the problem is not solved with a little adjustment, please consult a guitar repair shop.


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