Thanks Bax. I compared my un-touched pump off an SF-P to the one off this RF-P. The upper screws were similar in depth, but the bottom screw in the malfunctioning RF-P is set at least an 1/8" deeper. I may play with adjusting the bottom screw with it mounted to my SF on a test stand. But for now, I just want to get that Summit 3 in the air!