I've an upper opening window, downstairs, with seized hinges.
o Twin 2.5" bare steel hinge, full compliment of screws (typical!)
o Hinges seized, flick penetrating oil released the hinge at least

The hinge has dropped about 1/8" or so.
o The upper-non-moving hinge plate wobbles in the screws
---- so the window has dropped 1/8" - so re-closing is impossible
o Slotted-screws seem very tight indeed & refusing to budget
---- no rot, simply the seized hinge has caused the play over decades

Q: What's the best way of getting the screws out?
---- heat with micro-torch/torch + penetrating oil + hours of patience?
---- or grind off hinge-pins-ends & knock pin out, or grind off the hinges-pin?

Q: Since 2.5" & 3.0" hinges are similar, can I interchange them?
---- reason is that 3.0" come in Stainless Steel :-)

The window only opens to 45 degrees, as it's outer lip hits the frame.

What works best?
--
Dorothy Bradbury