I am the proud owner of a 10lbs rabbit, which is to say I have the exact same problem. This time bunny did my girlfriend's macbook charger right at the base of the cord, the hardest spot to repair. I knew I was going to have to crack open the adapter block, but a cursory inspection reveals that Apple fuses the plastic casing quite robustly in lieu of screws or fasteners. Gah! So, after experimenting with several other techniques recommended on other sites. (One of these involved a mallet and a flathead screwdriver, and it apparently woke my neighbor up at 2AM...Sorry, dude. Will have to leave a note.) Anyway that's when a better idea dawned on me. I was trying to slowly slice through the plastic seam that keeps the powerblock sealed with a box cutter and a fresh razor. This wasn't working very well. But, I DO have a gas stove in the kitchen. After heating the edge of the razor blade to discoloration, it will slice right through the seam for about 4 seconds before you have to reapply heat. No need to worry...