how to remove old steel shaft from irons
If I may add, it’s always good to use safety goggles and have a fire extinguisher nearby. Be sure your grip solvent is nowhere near you when you heat the hosel. When heating the hosel, you may have a small flame from the melted epoxy (or if any of the ferrule is still there). You can easily just blow it out. A heat gun is safer and slower, but is definitely better whenever you remove a graphite shaft. As Popeye said, be sure to do a thorough job of cleaning out the hosel while it is warm. Here is a link to more info on reshafting: https://www.golfworks.com/images/art/2008ReshaftSteel.pdf.
Hope this helps! Michael