I recently checked my emergency exit window. It was slightly stuck and then swung way out and took off. Fortunately did not break. I always thought it was hinged on top. Not so. There are two C shaped metal pieces that interlock but not very securely. When I went to re-install with a little effort I could pull it off on top. Still the manufacturer said it would be okay. First time I drove with it I was constantly checking but it stayed on even on some rough roads. But now I am reluctant to check it again for sticking. Some on the forums say not to open it – it is a one time operation.