frank wrote:
Nice idea, but if you pull on those real hard they just open anyway. Try
it.
Like certain candy machines with steel "flapper" gates, these will keep away
the
10 second thief. But the 60 second thief has no problem.

A hose clamp with an uncommon screw is at least as secure and costs much
less.

A spanner of the correct size may work.
If you simply filled in the slot, then you'd need a socket of the appropriate
size to unscrew it easily.
Torx can be defeated by a jamming a straight screwdriver in the slot, if you
can find one the right sixe.