My steering on my 57 is loose. by that I mean while driving my steering has me constantly moving the steering wheel left and right to keep it in a straight line. My old ford panel truck back in the 60's had a screw on the steering box to take out the loose steering. My 57 chevy also has a screw on the steering box but I want to know if it is an adjustment screw before I make any attempts to make an adjustment but just end up screwing this thing up. I know this is the area of problem because all tie rods etc are tight and no movement.