"....My friend and I have been building guitars in my high school woodworking class over the course of this school year. This will be the last order we place for this project, and I wanted to say that we have found your website, products, and customer service to be extremely useful. When my friend encountered some issues with bending the sides he purchased, he emailed your company to ask for advice, and, very quickly, received very helpful advice."
The Nut and Saddle setup gauge is machined of aluminum with four troughs measuring depths of 1/32", 1/16", 3/32", and 1/8". Each slot can accommodate a 1/4" wide nut or saddle. You simply place the nut or saddle in the trough and draw parallel lines on both sides of the piece, depending on how much material you want to remove.
It's quite simple to use: Say you want to lower the action by a certain amount. Measure the height of the low E string over the 12th fret. If you want to lower the action by 1/32", you remove twice as much from the bottom of the saddle, 1/16". Place the saddle in the groove stamped 1/16", mark it with a sharp pencil on both sides and sand on the belt sander or use a file.
Note: The thickness of the gauge itself, 1/4", also serves as a depth stop, giving you a total of five different depths.