i have had the pivot points on other mowers get bound inside and make it very hard to move up and down. i had to take them apart and clean and reassemble and it was better.
i hope not though in your sake, as it could be a real pain to do on the grandstand. i was looking at ours yesterday and thought about possible scenarios where i would have to take things apart and since it is so crowded, it would be a bear.
and then, what if it was not the cause!!!