Hey Rick,
I'm sorry but I couldn't get the lower screw to budge. The first I was able to get to turn with a larger screw driver, but the lower one refused to dislodge. I'm starting to strip the screw which I'm afraid of.
I took a few photos of the buttplate; I know this won't reveal what you're looking for but at the moment it is all I can provide. What should I be looking for? I'm not well educated on butt plates other than the 2S marking.