If the truss rod is too loose it can cause neck bow ... turn counterclockwise to add more relief. After each 1/8 turn adjustment either way, check with the feeler guage again.

Adjusting your truss rod might feel like a tall order the first time you attempt it, but with a little background knowledge and guidance it;'s an easily achievable piece of DIY guitar maintenance.

We need a feeler gauge to check which way we need to adjust our guitar’s truss rod ... If the gauge doesn’t touch the low E string, turn the truss rod nut clockwise by ⅛ of a turn then check again. If ...