I recently had one bend the back corner but only about 1/4" - 1/2" with a fairly low jams. After going through it several times and finding nothing that I thought could possibly be putting the originals in a bind, I blew it out with an air compressor at 90psi (heh heh). This worked, but I never found the culprit. I am assuming it was a hidden staple or something...
Bookmarks