On Fri, 02 Jan 2009 11:09:44 +0000, Adrian wrote:

Is the metal protrusion on the left just a poorly-punched-out hole - or
is it there a reason ? (before I take a hammer to it!)

Looks to me like a poorly punched hole but the back of it is still flush
with the hook, so where has the metal sticking out the front come from? I
suspect you'll find two discs in there if you whack it clear.

--
Cheers
Dave.