This:http://www.officesupersavers.com/viewItemsAct.asp?classlabel=UUAA&manufactlabel=1700305&sku=SWI9112&gb=1&utm_source=GoDataFeed&utm_medium=ShoppingEngine&utm_campaign=Nextag&gdftrk=gdfV21806_a_7c446_a_7c1526_a_7cSWI9112And it works like a charm. I don't print my covers to full size, either, so I have two sides to trim to make a 1/4" border around the whole cover, and this thing is a wonder.
I use one of this. got it at the fleamarket for $0.25