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.
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Originally Posted by Simon Barden
