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A new soldering tip does not fit in the heating element!
The insertion pipe inside the soldering tip is burned onto the heating element.
The insertion pipe inside the soldering tip is sometimes burned onto the heating element due to flux seeping into the inside of the soldering tip. If such is the case, a new soldering tip may not fit in since the diameter of the heating element has become larger than normal because of the thickness of the insertion pipe.
* The insertion pipe does not usually come off easily.
■ Insertion pipe burned onto the heating element
If the insertion pipe (metal) inside the soldering tip is burned onto the heating element, a new soldering tip cannot be inserted into the heating element. Normally, as shown in this photo, the white ceramic part appears when the soldering tip is removed.
Solution

　Remove the insertion pipe with a tool.
Do not reattach the insetion pipe to the soldering tip for reuse. If it is reused, the unit may not produce a temperature high enough for good quality soldering.

Required tools   Longnose pliers, etc.


When the insertion pipe cannot be removed even using a tool

Replace the heating element and soldering tip.
 
Advice and tips To prevent the insertion pipe from being burned onto the heating element, periodically loosen the nut and repeatedly remove and reinsert the element cover and soldering tip.
After soldering work is finished, each part of the unit remains very hot. Before you start the work mentioned above, wait until each part has sufficiently cooled down.

To prevent the insertion pipe from being burned onto the heating element, periodically loosen the nut and repeatedly remove and reinsert the tip enclosure and soldering tip.