If it just held in with a rubber moulding this is what you do.
Place the moulding on the glass then wrap a piece of cord, say 3mm nylon, around three sides (2 sides and top) pushing the cord deep into the slot. Then place the glass and moulding onto the bottom side of the opening. Important..use lots of lubricant, neat dishwashing liquid or similar, don't use grease. Push the cord ends through the opening and then simply pull the cord out a bit at a time to manoeuvre the moulding over the lip of the frame. Easy.
Hope this helps.
Bill
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