If getting the shock links on is extremely difficult then something must be wrong. After all they were installed on a moving assembly line with only a limited time allotted for the job. On my 29 tudor three of the four went on easily using grease to "glue" the parts in position. On the fourth one I experienced all the terrible trouble described above. The problem was a burr that was left on the inside of the tube during manufacture. This burr kept the spring, spacer, and lower cup from sliding all the way down to the lower ball. It was then impossible to compress the spring (that was up too high) enough to slip the cup under the upper ball. Taking the tube down to my workshop and using my Dremel tool to remove the burr solved the problem. It then went on as easy as the other three.