I'm installing shocks rebuilt by a professional rebuider about 3 years ago and they've been sitting on the shelf since then. I'm now installing them and according to Les Andrews book "Model A Ford Mechanics Handbook" (Page 1-256) he says that after mounting the shock unit to the frame and the shock arm is installed, move the shock arm up and down by hand to test the up load vs. the down load. My shock arm cannot be moved at all in either direction. Two Questions: 1. Is this statement correct? Can they can be moved by hand force? 2. If they cannot be moved, should I consider these units as unusable or will the much greater force between the axle and frame while driving make them function as they should?