Gordo - If you have a Dremel tool you might drill a small hole through the side of the knob and slightly into the controller's post; using a small self tapping screw, thread it carefully through the hole and into the small divot you made on the post. Some LocTite or nail polish should keep the screw from backing out. A good electronics store might have a metal knob with the set screw included that would fit the controller post. Dave