In article , Chris J Dixon
writes

Further investigation is currently blocked, as one of the screws
in the top moulding, which is the first step to dismantling the
machine, has a one way head, looking rather like this:

http://www.alliedboltinc.com/product...Y-R/H-MACHINE-
SCREW-STAINLESS~2263.aspx

I may be missing something but can't you just drill the head off?

Centre punch the middle of the head and drill with the largest dia drill
that will fit between the lobes. Even if the shank isn't parted by the
time you are through the head then it will be seriously weakened and
turning the screw so as to tighten it should shear it off.

Once it is apart, remove the shank by gripping the remnants in pliers or
mole grips and replace with a plain self tapper.

Next time Lidl/Aldi have an offer on, buy a set of screw extractors ;-)
--
fred
it's a ba-na-na . . . .