Our Uni 1’s back form roller gear is spinning out on the starting teeth of the rack. I’ve changed the roller height, made sure the end screws on the roller core are tight, made sure the spring beneath the starting teeth is free of debris (it depresses with finger pressure). I’ve had this issue on other presses before and it’s usually remedied by changing the roller height. I’m stumped and appreciate any advice you can offer. I’ve included photos of the rack and gear.