Abstract: A variable resistance device of the type wherein a worm screw is utilized to move a contact bearing member through a path of travel relative to conductive and resistive tracks. The variable resistor includes a ratchet member having a single elongated spring section attached to a body portion. The body portion has two rigid legs extending therefrom. The spring portion of the ratchet member is disposed within a groove formed in a surface of the contact bearing member. The rigid legs of the ratchet member are the sole elements in contact with the worm screw when the contact member reaches the end of its travel relative to the resistive and conductive tracks.