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The bit holder resides in the clutch housing which has a collar with a ball bearing that the notch in the bit holder snaps into. It would seem that the ball bearing has slipped out of the cooler on the clutch housing, therefore nothing is locking it into placed. If you need a diagram, let me know.
Try cleaning the spray tip , if you can get the tip out just soak it in all purpose solvent for a while if its not that maybe the paint is too thick try thinning a little with appropriate liquid [ turps or water ]
Although safer than using a naked-flame blowlamp, care is still required when using a heat gun. Specific point are:
* Because of the power of these tools (up to 2000W), when an extension lead is necessary, only use a lead rated at 10 amp or greater and always completely unwind the lead.
* Never obstruct or cover the air inlet grills. If the air flow is reduced the heat gun will overheat and possible catch fire.
* Never operate the heat gun with the outlet nozzle hard up against a surface, this will reduce the air and can have the same effect as obstructing the air inlet grills,
* Do not use a heat gun near inflammable materials.
* Always switch the tool off before putting it down on any surface.
* Allow the tool to cool before storing it.
* Do not place the nozzle next to anything whilst it is hot.
* Never touch the hot metal nozzle with clothing or skin.
* Do not use for stripping lead-based paints.
* Do not allow any paint to stick to the nozzle - and if some paint does stick, allow the gun to cool down and remove the paint.
* Do not look down the nozzle while the gun is turned on.
* Do not insert anything down the nozzle with the gun.
As such a simple tool, there are not many differences between one model of heat gun and another - but there are some features which are important.
* Wattage - commonly from 1000W to 2000W (a measure of the power of the gun). Providing that there are heat and/or airflow controls, the higher the wattage, the better.
* Main control switch - usually mounted on the front of the pistol grip, and normally a 'dead man' switch so that power is switched off when the finger pressure is removed - an ideal safety feature as the heat gun stops if it is accidentally dropped.
* Temperature setting - at least 500°C is needed for stripping paint - the lower the bottom end of the range the more useful. A choice of controls make the tool more useful.
* Airflow setting - having variable or more than one speed makes the tool more versatile.
* Thermal cut out - this will switch off the tool if it becomes overheated. If this occurs, it indicates a fault in the tool or method of use - for safety, the fault must be identified and corrected before the heat gun is again used.
* Flex length - lengths of 2.5 to 3 m are normally fitted, this means that when using an extension lead, the tool can be used at the full reach without having the socket hanging in mid air.
* Hanging hook - useful for storing the tool.
* Surface stand - this enables the heat gun to be safety 'rested' during pauses in the work and after uses. It also allows the gun to be used 'hands-free' when two hands are required on the work piece (such as when bending a plastic pipe).
* Nozzles - most heat guns have a range of nozzles that can be fitted for specific uses, generally these need to be purchased separately. The main types of nozzles are: 1. Reducer nozzle - when you want to concentrate the heat onto a specific area.
2. Reflector nozzle - wraps round a plastic or copper pipe to spread the heat around the pipe surface.
3. Flat nozzle - for spreading the hot air over a wider narrower area.
4. Glass protector nozzle - for use when stripping paint on a window to keep the direct heat off the glass.