I grabbed a late seventies Yamaha FG-140 dreadnought-sized flat top at a yard sale last week. All original, apparently including the strings. Sunburst laminated spruce top, mahogany back, sides, and neck. Hardly played, but a good number of dings, pretty beat up, and generally unloved all of its life. I bought the guitar from friends that date back to high school days. Their late dad was a prominent music business lawyer, Horton Frank. The story goes that Ricky Van Shelton gave Horton Frank the guitar to keep in his law office so that Mr. Frank's various artist and songwriter clients could play him new material when they came to the office. The daughter said Mr. Frank had no interest in guitar, and that the instrument stayed in the corner of his office for a couple of decades. Pics to follow. I picked up and laid down the guitar several times, and even left the sale for an hour and then decided to go back to get it. The 70's, made in Japan, Nippon Gakki label FG-Series Yamaha guitars are known to to play and sound pretty good. I thought this one sounded real good even in its unloved state. The action was a little on the stiff side, and I knew the 40-plus year old guitar would need a truss rod adjustment. No biggie. Long story short, through the miracle of the internet, I found a great Yamaha FG Series enthusiasts site. Here's a post showing how best to adjust the truss rod: http://yamahavintagefg.com/how-to-properly-adjust-the-truss-rod/ Sure enough, the truss rod won't tighten the sturdy 40 year-old mahogany neck, so I'm either going to make a "Back Bowing Block" and pre-bow the neck myself as per the link, or take the guitar to a tech and let him do it. Man, it kills me to take a $100 yard sale guitar to a tech, but I think this one might be worth it. Anybody have any experience with such a thing, or have any advice to offer? I would like opinions on what the probability of me being able to properly do this myself are. I think I can.