Next, I had to machine two specific custom parts from aluminum. The first round cylindrical object has grooves for each of the six strings that allow them to wrap around the bottom of the guitar to the back with the correct spacing. The second part is basically a metal plate with holes in it to hold the strings at the top of the guitar along with a hole that allows for access to the truss rod. I spray painted both parts black in order to fit the color scheme of the guitar.