Another trick (other than using the correct JIS driver of course) is to give the screw a slight nip in the clockwise (tightening) direction prior to trying to extract it.
I finally decided to attach the side rails that came with my Portable Zero Pack to my 817nd.? The two screws on either side are so tight I can only barely loosen one of them.? The other three are way to tight and I don't want to damage the Phillips head screw.? Does anyone know of a method of loosening screws that are so tight?? Appreciate any and all advice.