I;ve read of two different methods on the forum.
The most complicated, but more like factory, you put the assembly into an oven at a specified tempature (sorry, can't recall exact #), and the seal will become pliable. Then you can carefully pry the two halves apart.
The other, a member used a dremel tool and carefully cut apart the two halves.
In either case, you do what your project requires and then reseal the halves back together. Don't remember what they used to do this part.
Hope that helps....