Springs Connecting Rails on Vandercook Uni-1

Two questions and thanks in advance.

1. The outside rails on the Universal 1 have a spring inserted into the end of one rail which then butts up against the other. What is the purpose of this spring given that the rails are screwed down to be stable?
2. The inside rails have large head machine screws that go into rail, a collar and then screw into the press bed. These are *very* hard to screw back in (and they were hard to get out). Any idea why and any tips? Thanks, Neil

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