Hi all-- Have recently purchased a MacBook for my daughter who will starting college this fall. The school strongly advised purchasing a cable lock for her computer to use in the dorm and library. Am quite frustrated invetigating options to find that Kensington locks are not compatible with the security slot in the MacBook (per discussions with their technical person today)--the lock seems to scratch and dismantle the metal plate inside the slot. They are sending me a free security slot adapter which you glue to the laptop and works with the Kensington locks. Belkin is researching through their product manager whether the F8E550 is compatible since users posting on Amazon claim it reamed their slot. Does anyone have a lock that works well on the MacBook? Anyone have experience with the Tryten brand? Which locks are compatible with the MacBook security slot? Thanks for your help. It's hard to believe something so basic yet vital does not exist for the MacBook.