A string support for a musical instrument comprises a string support body and a plate set. The string support body has a length, a height, a top surface, and a cavity that recesses into the top surface of the string support body. The cavity extends in a primary direction and has a width and a depth. The plate set comprises at least one string-engaging plate (e.g., one per string) and at least one spacer plate per string-engaging plate that seat within the cavity, stacked in a direction of the width of the cavity. Moreover, each string-engaging plate can have a string-engaging edge (or passthrough) at a height greater than a height of each spacer plate. The order of the spacer plate(s) and associated string-engaging plate is adjustable to position the string-engaging plate forward or backward in the direction of the cavity width.