I had the same problem, Dillon sent me the tool to align the press, they said if the link pins are warn, it creats some side to side movement, they said to align the press, and while tighting the screws in the base, to have the handle in the center of the movement, do not tighten the base screws with the handle clear left or clear right, my machine seems to work ok now, they said if the movement in the linkage becomes worse, it will have to be sent to Dillon for repairs, George.