IB-4 FRetless bass Truss rod.

[randomguitarist]

Hi, can anyone tell me is the truss rod fitted single or double action?

The neck I received has some backbow with the rod slack. The string tension just about pulls it flat but I can't get any relief to appear. I know I don't need much relief,but I'd like to be able to achieve some.

Thought I'd ask here before getting the sanding block out,

Many Thanks,

Grant.

[McCreed]

TTBOMK all PBG necks are dual action, at least the 6-string electrics. However I have no direct experience with their basses.

I'm sure one of the many bass players here will weigh in eventually.

[Simon Barden]

Yes, all the truss rods should be double action. The design of a double action truss rod in its square section tube means it’s much easier for the factory to install than a conventional single action rod, with a couple of simple routs needed and no curved inserts required.

If the rod is slack, then it’s in the mid-position and doing nothing. So turning clockwise it should start to bite and give some backbow, whilst turning anti-clockwise will give you some concave relief.

[randomguitarist]

Yes, all the truss rods should be double action.

Excellent, thanks for confirming that