hello there - i have just replaced a faulty fire hinge on my upvc window, that was letting draughts in. i replaced it with a similar 17mm Yale hinge, 1st and 3rd screw holes aligned, the middle needed drilling as placements were different. the back of both hinges are flush to the wall, the window closes with a little catching (i.e - it isn't completely smooth), but it closes and the gap left by the faulty hinge is gone. my only issue is, i cannot close the handle downwards once the window is shut. when i try to engage the locking mechanism, it seems to be catching but I'm not sure why. i've attempted to recalibrate the positioning of the hinges and initially thought the issue was due to the hinge being too long, but the screws align. any ideas on how to resolve would be grateful appreciated as its driving me MAD! thanks!