I believe this is why the textual private keys aren't lined up so any damage will damage different parts of the key. See http://i.imgur.com/4Pmh5lp.jpg ( grr, had the wrong link here before I decided to remove the half letters to simulate more damage ) -- [ printed wallet, cut the flap in half, and removed any half letters ( simulating a pretty huge space of damaged textual key -- and honestly, I really doubt damages from a fold will damage exactly one letter ) ] -- QR code removed because I'm feeling silly and have 0.05BTC sitting on that address if anyone can recover the private key.