Hi there, I have an existing (skylight) window in my bathroom, velux style only it's a metal frame. It's nigh impossible to open as it's so high up, it has an old fashioned closing mechanism, hinge and lever is it called? I have other velux windows and a rod which is great, but I can't use it with this style of opening/closing. The existing window is 550*610. The smallest window from Velux is 550*780. Has anyone any suggestions for other windows similar to Velux that could be opened and closed in a similar Velux fasion? Thanks a mill.