I've got a Sears 10" moldboard plow, has the 3 pt hitch. When I put it on the tractor, I noticed that when I started plowing, the plow rotated upward and the point came out of the soil. Noticed that the top link on the hitch had been forced downward in a rotation move. Hence, the plow rotated and came out of the soil. What am I missing here? Is this because the plow is too light and won't stay down? I've noticed some folks have a lever that they hold down as they run along the plow row. I don't have that, I can't be the only one who's had this problem.