Nope, I don’t play the bass, but I picked one up as part of a deal. Opportunity: l2Fix bowed neck.
I started with this video, showing how to straighten the truss rod on a vintage guitar. This one has a slight up-bow ( towards the strings ). This appears to be a common problem as the strings pull on the guitar neck over time. The truss rod is designed to counter this. The more you tighten the truss rod, the more the neck will bow backwards ( down-bow ). This way you can keep the neck straight. in theory.
I followed his instructions:
loosen strings and loosen truss rod nut
put wood blocks on neck
cut blocks to fit between frets. Tried to cut a fret line into a block and almost chopped into my finger. can’t wait to get video camera set up, so you can see all these near mangles on future projects
mark blocks before cutting. this makes sure the same side is used as “up” and keeps width consistent.
gently tighten truss rod nut. I’m not sure how tight it should be. so I just did it to where it felt snug without too much torque.