SORRY in advance for the dumb question. I am completely new to the AO community. I recently purchased my first AGD product an xmag and I have searched all over but I can't figure out how to get the valve out of the marker. I removed the the screw from the back of the marker and the valve will not come out. Does the trigger frame have to be completely removed or am I just missing something. I normally wouldn't post this but I have searched and I've come up with nothing.