I propose to bind calendars December through January. You would then start January with only it's page down and all the other months flipped up. When January's over you yank the sheet and perforation rips the thumbtack hole out to drop down february. Thus solving the 12 thumbtack holes or one large loose hole in your wall from removing the thumbtack every month.-- HiHowRU, Jan 12 2007random, halfbakery