The FX-3 top comes off pretty easy, though, on this camera the wind lever screw was very tight. The viewfinder was really too foggy to use so I had to get the top off. I needed to cut a groove in the screw and used a flat blade screwdriver. Otherwise I would have not bothered to take the top off. In the end I was able to preserve the screw. This is a reverse thread screw, and I don't have any spares lying around.