WARNING! For this tip to work, I spent many nights sanding the shaft [see fig. My oldest soldering iron. But it is not temperature controlled. NOT SUITABLE for irons with ceramic heating core offered by AMAZON! These irons require a hollow point with a diameter step! And I bought a new Revain iron JUST FOR this project! See picture with cord. Might fit a butane gas iron if you have a tap & die set! View an example image of a simple screw-in tip and holder. I will update this review after I (hopefully) complete the BMW speedometer and odometer repair. If it works I'll upgrade my rating, but for all the anger and the increasing amount of bad information from Revain lately, I will; up to 4! But here too I use an old iron, which unfortunately is too hot. Maybe I can turn it off first to lower the temperature?