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If they are large/heavy or difficult access (over a side return with glass roof) it's really a 2 man job. I've pulled some stunts with rope to ensure a window can't fall 3 stories but it's nothing I'd want to describe in a court of law!
With the screw holes you can usually drill a pilot for the new screw positions if they are different from the existing.
People worry about double glazing but it's probably less complicated than a sash window.
Thanks for that info. I will look at the Phocas hinges to check if there are any problems with the position of the screw holes. I am a bit worried about handling the weight of the window while fixing the last screws. I am thinking of rigging a sling from a ladder outside the window. It is a bit tricky as the one in the photo is above the porch roof and one of the others is above a big bay window.
This might be a silly question - do they come in matching pairs when you buy them or do I have to order top/bottom or left/right ones?
I found this naff video https://m.youtube.com/watch?v=LKQ4NpViQJ where the Handyman cuts out the scenes where he almost drops the window outside.