You can sometimes drive them round with a sharp dot punch at the bottom of the ramped part

I have had this problem, the solution is simple. Silver solder a U shaped piece of steel onto a standard screwdriver. I have plenty of old screwdrivers and this solves the problem.

I have a large range of security bits, but the manufacturers who make them don’t seem to have got round to this new type yet. I am sure they will be available soon!

Andrew

Drill a small hole in each of the two flat areas of the screw head, preferably using a small centre drill. Insert circlip pliers, two thin masonry nails or two thin silver steel rod into the holes.

Alternatively, use an inline junction box such as this example:
https://www.screwfix.com/p/debox-16a-2sl-in-line-junction-box-50-x-29-x-97mm-white/9858R?tc=MT1

Also , try searching Clutch Head Removal Tool , and example of which is the CTA Tools 8752 4 piece set on Amazon

Vic , Yes , that’s one of the ones I spotted too . Do you have a reversing impact driver to use them with ? I have a kitchen fitters Makita one which I find very useful for removing screws which I could not otherwise easily remove by other methods.

Not had occasion to try this. Hardened steel is easily drilled with PCB carbide micro drill bits in a Dremel (get a set from an Ebay vendor), and with care there is little risk of breaking the bit. Drill two opposite holes of a size so that short bits of MIG wire are a close fit and use an ordinary screwdriver across them, or snipe nose pliers, or make a pin tool. Ingenuity needed, but seems promising to me.

How about cutting off the plug and jointing a new length of cable on. You can get good connectors even waterproof as well.

David

This is a non-rewireable extension lead. By law in the UK they are designed to be non openable. Even if you get it open there is likey no way to connect a new cable in a manner the retains the safety and relibility of the original. It should not be re-wired

Why not fit an IEC 60320 C14 “kettle” / “PC” male connector to the existing lead and use a standard C13 power lead plugged into that?  There are also ready made C13/C14 leads that can be used as  extensions. Depending on the lead used this could reduce the maximum load to 5A but thai is not an issue for IT type equiment.

Robert.

All this fuss for an extension lead, there is a reason they put tamper proof screws in, why not just plug it into another (longer extension lead?