What you need
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The swivel on the mains cord is held back by 2 screws also easily accessible when the arms are separated
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I bend the small pickups in the white part a little bit to make then just a bit tighter. (I dont know if this was the loose connection, but after assembly the blue light signalling heating started working again)
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Caution, the parts inside carry (in my case 230 Volts) So checking for loose connections while taken apart should be done with an Ohm Meter or similar.
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Conclusion
To reassemble your device, follow these instructions in reverse order.