I did some measuring of the blades height at all the way up. and one side is 4 inches while the other side is 4 3/4.I put two medium size bricks on one end and the sides were like 1/4 inches apart. I have yet to look at the rockshaft, but I do think that is fine. I did have this issue with my snowblower only lifting up side up, but that is becasue of a missing pin that goes in the quick attach.