Incase someone is interested, the names of the
security bits are...
[...]
what I might
call "butterfly" bits - [...]
That sounds like a 'clutch bit' as
far as I can guess. Does the head
look like an hourglass if viewed appropriately?
A bit - an hourglass with curved, not straight, "top" and "bottom"
edges, and with a rather fat waist-pinch. Oh, and straight lines from
the corners to the waist pinch, not the curves most hourglasses have.
Oh, and I forgot to mention, in my enumeration of the bits, the regular
torxes. Not that I think the omission terribly serious....
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