Hello. I just wired up a Lionel Swingset (6-14199) that I'd purchased used. I was surprised to learn that this accessory makes a good deal of noise. A lot of mechanical sound is present, as well as an audible 'clunk' when the magnet -carrying mechanism reaches the end of its travel. Is this normal when new, or has this swingset spent maybe too much time swinging? Thanks, TJ Coss