troubleshooting Question

How to open this screw

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viki2000Flag for Germany asked on
MiscellaneousComponentsPuzzles / RiddlesHardware
37 Comments18 Solutions470 ViewsLast Modified:
I have an extension cord broken and I want to repair it.
It is closed with special head screws, which seems are made only to be tightened.
The head does not allow opening with a normal screwdriver.
I have a set of industrial, special screwdrivers, but none of them helps.
I tried to drill the head of the screw with gold type HSS drill bits, under 0.5 up to 2mm, but it is a very hard material and did not help.
The screws are fixed in plastic/aluminum case of the extension cord. They are not glued. They just need to be unscrewed.
So, how shall loose/open these screws?

Any helpful hint is appreciated.

screw_1screw_2screw_3
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