Knob with Cap

This knob is designed to work with either a 1/4-20 bolt or 1/4-20 nut depending on whether you need a male or female knob. The nut or bolt is inserted into the hex hole and is glued with a thin CA such as Loctite 420. When making a male knob, it works well to fill the hole with epoxy, such as 3M DP110, and then add the cap.