My retired electrical engineer father-in-law gave me his old beloved Ungar soldering iron for doing my flashlight mods. I of course broke the original tip like an idiot, and was going CRAZY trying to find a replacement. Started hunting around on ebay and tried a couple that were the wrong size. Fortunately I got ahold of someone who really knew their stuff and he helped guide me to exactly the right part. There were so many that were almost close, you really need someone who knows what part fits what iron. I'll PM you the username if it helps.