I own a magnifying lamp that I purchased (somewhere on line) more than a decade ago. Unfortunately, the lamp sat on a shelf (then in a box) for more than five years after the joint that connects the head to the arm broke. It didn't occur to me to search for "magnifying lamp parts" until recently. When I did, the search led me to Boli Optics and I found the Joint, Knob, and Screw (https://bolioptics.com/joint-knob-and-screw-for-magnifying-lamp-mg16303-mg16303111-0003/). I didn't know whether this would fit my lamp, but I took a chance and ordered it. It arrived a couple days ago (on time, as promised) and it fits perfectly in my lamp! Yay! Another item saved from the landfill! I heartily recommend Boli Optics for any magnifying application!