Help !!!! Please can anyone tell me if you can reapair a broken double glazed window lock. The window is locked by the handle and a key in the handle. Tha lock still works on two of the three locking points but will not disconect from the bottom point and the window will not therefor open. When I push the window when it is unlocked the top and middle of the window has some give to indicate that part of the lock is ok, but the bottom lock has no give what so ever. I have tried prising the bottom section open with no joy. Suggestions please, will I need a completley new window and frame or is there some way of getting to the broken part of the lock etc. Thankyou for any help or advice recieved.