Nechville banjos have a unique system called the Heli-Mount system. With this system, one adjusts head tension by turning an internal ring inside the Heli-Mount frame which uniformly tightens or loosens the tension on the head. Here you see the two wrenches in position to turn that internal ring. In this photograph, the neck and resonator have been removed. The Nechville Musical Products Company is located in Bloomington, Minnesota and is owned and operated by Tom Nechville.