A machinist I am not as of yet but I had saw people testing them with dial indicators and they actually pulled down tight on the parallels so I expected as much and it's not how mine works. I was knocking everything down on my old vise for the last 3 years, I just expected to eliminate it and just check the supports underneath and go so I am disappointed. I guess I trusted my eyes and never asked around first. My point is I would not have paid KURT prices if I would not have solved that deal. In my mind I guess I combine the slight lift with a rough turning overly tight screw feed and the two add up to disappointment. I could of been disappointed for less money, all I got and I do cherish it is American made and my money continues to circulate in the good ole USA s little longer.