The psy seemed to work better for me fully inserted but I was not able to adjust the tabs so they hit the right spot.If I moved them in the body was not in far enough if I spread them out they weren't even touching.I decided to use a pliers placed right next to the stem and turn the arms up which I could not do by hand.This raised the tabs up enough so they are now fully engaged yet spread out far enough to probe the right area especially the perineum.So now the body is fully inserted and making triple contact better than any model I have used so far.I right away noticed the firing reflex loop between the prostate and the perineum as they feed off each other.The top edge of the tabs now lines up between the second and third nub on the main body and stays fully inserted.The p&k tabs and the head making simultaneous contact feels awesome.