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If it's got an accessible screw/fixing holding it in place from the inside, or on the edge where the locking action happens, back that off a bit and give it a squirt of something oily.
Nothing is accessible sadly, the most I could do I think would be to remove the handle, but the stuck pin is ~35cm horizontally from the handle.
The locking bars within one of our double glazed windows has jammed in place - bottom left corner.
The other pins will shift to the unlocked position, but even after some light percussive maintenance the bottom left won't shift. How to make fix?