I found this Forum when I was looking for information about the diamond 3 button key fob - not that I have a problem. I was nevertheless curious to know how difficult it would be to create a third key as a spare. I am in my 70s so I find myself misplacing keys. I am a retired engineer so cutting open and replacing batteries should be within my skill set. I would like to know more about programming however as I note that there are quite a few genuine used keys being offered for sale. If the programming can be mastered then I will find a way to replace the metal key piece. Anyway, that is a project for the future - unless someone tells me otherwise. with thanks.