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A temporary solution to get it closed unless this is a daily use window, would be to pull the top corner in as you close the window. Really needs a suction cup, or push against it from outside. once fully closed, they usually stay there until next opening.
Cheers for this. Pulling it closed with a suction cup has left it pretty well sealed and it's not going to be opened often in the winter.
A length of 2x4 with a block screwed to one end to capture the bottom edge of the sash and a friend to use it as a long lever can probably take a useful amount of the weight.
Even using it regularly, the sashmate was an expensive purchase. It helps a lot, but you still have to lift the sash inside which is the awkward part.
At 1m sq, I'd probably take the glass out if the glazing beads seem easy to pop free.
If you have any smaller windows with less than perfect hinges, practice on one of them before attempting this one.
A temporary solution to get it closed unless this is a daily use window, would be to pull the top corner in as you close the window. Really needs a suction cup, or push against it from outside. once fully closed, they usually stay there until next opening.