Actually, I
once saw screws which looked a bit like Robertson (the
square-socket kind) but with a triangular, not square, socket.
Those turn up on
cheap domestic appliances over here. The only
possile reason for them is to make the device difficult to repair,
I disagree. There is also an argument for them in the form of
protecting consumers from the dangerous interiors of appliances.
Of course, depending on the appliance, this may not actually be a valid
argument. But if there's mains voltage present, it's an argument with
some force to it. (While you and I may be competent to fix things, and
competent to avoid hurting ourselves even in cases where we aren't able
to fix, most small-appliance consumers are neither. Worse, many of
them incorrectly think they are.)
Not that I think such screws are a good idea; like you, I come down
opposing them. Just pointing out that your "only possi[b]le reason"
actually isn't.
An Allen wrench of the right size should work. The one device I ran
into that used them used sufficiently small screws that I didn't have
an Allen wrench of the right size; my selection of them is poor, and it
needs to be fairly precisely the right size for this....
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