Had the pleasure of working on another Guild this week. Guilds are built like tanks and sound beautiful. It is interesting to me how they have always had a cult following. So many people are Martin fans, Taylor fans, or Gibson fans but every 10th person that has been playing since the 60's will bring up their Guild, their "player."
Personally, I do not think there is any doubt that Guild made the best 12 String Acoustic guitars. All you have to do is look at the history of recording and live appearances and you will see more Guild 12 strings than any other.
So to the repair . . . Jimmy brought his 1980 Guild F112 in and man has it been to battle - actually every battle in the war. An airline crushed the upper and that was repaired. The top has some serious "bellying," frets were pitted and worn, and neck has some major relief making it difficult to play anything other than cowboy chords.
The focus on this blog is the truss adjustment. Guild 12 Strings have a dual truss rod, not a dual action truss rod (think 90's Gibson garbage), but actually 2 truss rods. There is quite a bit of confusion about this setup and fears of adjusting. Do not have fear, they work just like any other truss rod, you just have two of them. The most important part is measuring your turn to make sure both are equal. Easiest way to do this is score each nut or mark it with a sharpie so you can see both turns are aligned to the same position. The next most important part (not be overshadowed by the other important part) is to be patient and take your time. Leave the guitar tuned to pitch and turn about an 1/8th of a turn at a time with vintage instruments and let it settle. There is no need to hurry. Clockwise when looking at the truss rod to reduce relief and Counter to add relief.
When Jimmy dropped the Guild off he had mentioned that the truss rods has never been adjusted. This can be scary seeing the guitar is 36 years old. I was expecting the worst. I had my faithful Armstrong nut driver gripped with the strength of Thor expecting a near impossible adjustment. I was expecting the worst creaking and popping noise you would ever hear. To my amazement, the truss rods turned and worked with the greatest of ease. I would suggest easier than most new guitars. The neck settled nicely, frets finished, added a little relief back and played her for 2 hours.