I posted my solution to the loose staircase in 4729 Dumbledore's Office below: (URL) like my solution because it allows the stairs to be rotated and locked back with the flick of a hinge. Take a look. (21 years ago, 12-Sep-03, to lugnet.general, lugnet.harrypotter)
(...) Hi Thomas, I had this problem with my newly acquired HP Castle. I had a similar idea of putting plates under the steps. Your idea with the hinges is great and quite unique. Ben (21 years ago, 14-Sep-03, to lugnet.harrypotter)
