ha! thanks for all the responses. I only need to remove the glass. Looking at it, if I identify the beading correctly (black, thin rubber strip around all four sides, no bigger than 5mm wide) - that can't be the only thing keeping in the 2 panes of glass? is the beading solid or flexible?
is it the stuff in this picture that is immediately adjacent to the glass and the aluminium centre?
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the beading is removed does the unit (2 pieces of glass and aluminium centre) literally come out into the room?
hmm. looking a this pic:
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we referring to the beading in this picture - i.e. the white strip that covers the black strip? do i remove the black strip first and then the white strip? that seems a bit more reasonable..
i may have a go on a smaller window first. and i think i may invest in a pair of suction cups or similar.
cheers,
Simon