The followng regular maintenance will prevent a tip from seizing.
It takes the same procedure for tip replacement.
Please ensure that a tip is removable before turning on the power for frequent use.
Every part is quite hot just after unplugging the iron.
Please make sure that the metal parts are cool enough before starting the maintenance.
Picture: Soldering Iron, MATCHLESS
The loosened screw in the picture is the one to fix a tip.
The other screw is for fixing a heating element inside. A tip does not come off even after loosening the screw.