Hello there! I have S500 form 1996. The handheld keyless entry devise (the one-button one)is broken though.I just bought a used one online to replace it with.

Does anyone know whether one can open these up to simply replace the actual key blade? Or are these things ruined once they are pupped open. Also does any one know whereI can get instructions on how to install the new one?

Any input is highly appreciated.

Thank you.