You would have to beat on it hard if the master splines were not aligned. Turn the input shaft to straighten the wheels, the master spline is in the top when centered. Put your glasses on if you are old like me. If the steering linkage is not connected, go lock to lock and find the middle. Once the splines are aligned, you can tap it down until the roll pin fits. You can tap firm, but not hard. You may have a bugered spline or dirt. Clean and inspect if necessary. Use a wide channel lock pliers to press the roll pin rather than tap it down.