Yes, they're always normal threads, and you always tighten to flatten and loosen to add relief. Just one tip... if you're tightening, either loosen the strings first or defeat string tension by bracing the neck in the middle and pulling back on the headstock. Just enough to see the strings move a little.
Another little trick, if tightening, is to turn the bass upside down, place the headstock on carpeted floor, tilt bass forward while holding the body at the tail pin area & pull back while pushing out at the neck pocket area with your lower torso. You can SEE the strings come close to the fretboard so you don't need to back off the tension. It's OK to over-straighten with the push while adjusting. It'll come back. Now turn the wrench while holding position. A TINY bit goes a long way.
B.
