remove one end of the damper and push/pull the piston through the limits, pay particular attention to where the wheels will be pointing straight forward, look for a "slack" spot, it can be very hard to notice it. But thats not your problem.
right the steering box is tightened by loosening the 19mm(?) nut close to the middle of the top on the box and very carefully turning the torque screw or allen screw in the middle, be careful, don't over tighten may only need 1 flat on the screw. Re tighten the 19mm lock nut holding the center screw in place