eddie k
Loosening the rear screw might not help but it will not hurt, you should loosen it if you can. Put a drop of penetrating oil on the stubborn screw (s) and wait a week. Then if you don't have a drill press, find a friend that does. With the fitted screwdriver as described by Raimey (grind and file to fit with parallel sides, fit closely) and appropriate protective padding, capture the screwdriver between the chuck and screw to keep it from backing out of the slot, and turn the handle to loosen the screw. If it is stubborn, you may need to grip the screwdriver handle with a "'vise grip" or something similar to provide leverage. Be very cautious with the extra leverage, the blade can't come out of the slot, but too much force can twist it off. Once the "bond" is broken, the additional leverage and holding the screwdriver with the drill press should not be needed and the screw will need room to back out. If this suggestion doesn't work, you should ask someone that knows what he is doing. Good luck.
Mike
