One of the panels in my double glazing will no longer open, the handle isn't locked but will not budge when I try and open the window. I've heard double glazing windows have a 'security bolt' which may shear if too much force is used. I don't know if my windows have these bolts but could they shear if say for example I have a heavy handed wife who slams the windows closed?
If so what's the best way to get this fixed as I wouldn't want to replace the whole window just to sort out one part not opening. I don't think it's closed properly as there is a bit of a draft coming through.