Is there anyone out there who could tell me how to take apart a Key Fob for an 07 Audi?

I need to get at the Transponder for a project I am doing, without damaging the Fob itself. ThanksIs there anyone out there who could tell me how to take apart a Key Fob for an 07 Audi?The only part of the key fob that can be removed without ruining it is the cover on the back. The cover can be removed with gentle pressure pushing away from the fob (I use a pocket screwdriver). This will expose the battery. Other than that the fob is sealed. I have opened a couple junk Audi fobs and taken the immobilizer chip out, but it ruins the fob.Is there anyone out there who could tell me how to take apart a Key Fob for an 07 Audi?use a brick