I've seen this thread talking about truss rods and some people saying Gibson's truss rods had no curve before 1960
www.mylespaul.com
I haven't found any info or pictures from Googling this so can anyone shed some light? Got any pictures?
The only thing I found is and it says they had a curve
nativeground.com
Gibson style truss rod install
I have been searching the Internet for about 2 hours now and can't seem to find a single thread on how to properly install and cut the channel for a gibson style truss rod !! I hear you can cut a straight channel and have the capping wood curved ? I have read that they both have to be curved I...
I haven't found any info or pictures from Googling this so can anyone shed some light? Got any pictures?
The only thing I found is and it says they had a curve

Truss Rods by Bob Smakula - Native Ground Books and Music
A Mandolin lesson for the beginner, covering everything from how to tune, pick, & learn a few tunes.
