I have an aluminium window whose espag locking mechanism needs
replacing. It is currently locked shut and I think that the only way
to open it will be to remove the glass and force the espag levers to
an open position. The actual mechnism that the handle goes in is
missing and it is only the arms that are holding it shut.

The double glazed unit is held in place with rubber seals. Can someone
please advise on how to remove it (without breaking the glass) tips on
putting it back would also be appreciated.

Many thanks

Jonathan