Abstract: A tunable inductor formed with a hard plastic tubular member having a low coefficient of friction. A length of wire is conventionally coiled about the outer surface of the tube or tubular member. A threaded tuning element is positioned in the tubular member. Holes formed in the wall of the tubular member each define a permanently deformed segment of the wall, with the segments projecting inwardly a distance sufficient to engage the threads of the tuning element. The thread engaging segments function as threads to engage and secure the tuning element. The holes in the wall of the tubular member are preferably filled with an epoxy plastic or the like. In a modification the tubular member is formed with deforming holes and preferably filled with cement to function as a strip proof or strip resistant nut.