Adam Aglionby wrote:
"Tamper proof hex" are normally imperial sizes and a quite common. Bits
are easily available in a kit, but on the larger sizes you can often
remove the pip with a dremel. That sort of thing aren't too bad, what
_really_ evil is counterbored 1-way clutch screws (managed to get one
out of a canon charger recently though).


Got to ask how?

This time plan A worked - lean very hard, turn very gently and the
screwdriver bites on the steepest part of the ramp (use a slightly
smaller driver than is proper for the head and it digs in a bit).

Plan B was a small drill into the thickest parts of the head and a
"snake eyes" bit.


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