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I would also suggest; if there is a screw that holds the tip in.. make sure it is tight. A few of mine seems to have this issue. If the screw is loose, it will only heat up a little; if at all.
another suggestion as Juke said is to make sure the tip is clean... another method I suggest is a damp sponge while its hot (if it gets hot); it's what I have used for many years with success
good luck...
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