Hey there. I have a JCS3040 and theres two nuts on the back of the neck by the headstock. What are those for ? I noticed today cause I was about to start adjusting the truss rod to get some of the bow out of my neck. I did not start though because once I seen those nuts I wasn't sure of there...
I'm looking into a used rg550 and got one offer with the following cracks on the nut bolt back:
What are your thoughts on it? Seller says that you can't feel them under your fingertips.