I attached a video of my issue. I recently had been playing around (in a separate project) with the screw mate and had it working like I had intended to work in this project. I want the lead screw to NOT translate, BUT rotate around the vertical axis, while the ball screw translates up/down the shaft w/o rotating. I tried "distance mating" the bottom face of the Lead Screw to the "Top Plane" but that just makes the ball screw spin in place with rotation of the lead screw. I've tried changing the order that I select the two parts, but nothing seems to change the outcome.