Abstract: A control knob assembly to be mounted to a panel for use with an adjustable rotary device of the type having a push and/or pull function comprising a control knob having a first portion dimensioned to be grasped by a user, a second portion which is cylindrical in shape and extends from the first portion and a bore extending into the cylindrical portion aligned along the axis of the cylindrical portion, the bore dimensioned to receive a shaft of the rotary control member. A mounting element for mounting assembly to a panel is provided and includes a plurality of annularly arranged, flexible clamping elements, each having a threaded outer surface and a smooth inner surface. The inner surfaces of the clamping elements generally define a smooth cylindrical bore which is dimensioned to receive the cylindrical portion of the control knob and the outer surfaces of the clamping elements define a threaded surface. A locking ring is provided and dimensioned to be circumferentially mounted on the clamping elements.