Sometimes I admire these online bookmarklists, being always available, not application bound and all but then again I refrain from using them, for privacy reasons. Not private at all are these two links:
Fun with squid, imagemagick and ARP spoofing which I found a pretty funny thing to do and reminded me of a similiar experiment back in 2001. Have a read!
Searching the web for how to specify a sectorsize on virtual/loop devices, I came across yet another wiki with lots of information and practical shell snippets messing around with loop devices. However, I still don't know how to solve the initial problem, blockdev --setss does not exist/work :(