Macbook power adaptor

I recently had an unexpected house guest, A rather friendly 6 month old rabbit called Puppy.
Puppy has managed to chew the wire on my power adaptor, not the mains cable (as I have read elsewhere) but the one from the power unit to the maglink connector. The power adaptor still works fine but the outer insulation is biten through and the strength and resilience of the cable is compromised.
Can this cable be replaced, ideally by me? There is no obvious way to open either the power unit or the maglink connector, so before trying I thought I would ask.
Dave
Macbook Intel Core 2 Duo   Mac OS X (10.4.8)  

I would suggest checking the cable thoroughly to be sure that it is still intact except for the insulation. If it is you could use liquid tape to make a nice clean repair that is almost as good as heat shrink once it sets up.
If the Brick is sealed like I think it is (plastic fusing adhesive) there is no safe, easy way to open it.

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