Securing fittings.

Problem is it is almost impossible to stay secure by having a screw with a trick head, and in these days of ebay and so on, anyone can have a set of last year's highest security bits for a few quid.

These  M3.5 security screws may be better as tamper resistant screws for sockets, but do order the right length, as being stainless steel they do not cut to size like brass would.  Unlike the one in your pic,  will not undo with a couple of crossed spikes, but even so there are kits of secuity bits readily available, ( including the 5 point bits as well )to defeat pretty much all..

Mike.

I have found them before on storage heaters, light fittings and other appliances, but it’s a first finding them on switches and sockets all through a house.

A quick rummage in the back of the van looking for a Wera screwdriver set resolved the issue and it now has two slotted screws.

I once made a ‘security screwdriver’ using a spare flat head screwdriver and an angle grinder.

You do have to be careful not to reduce the blade's tempering otherwise the legs will twist and bend.

Legh

I once made a ‘security screwdriver’ using a spare flat head screwdriver and an angle grinder.

There's posh … I made mine with an old screwdriver, a hacksaw and a file. 

    - Andy.