Hi Bobby,
I have a 03 Contessa that has the slide locks on the large slide behind the drivers seat. If the lock you are describing is the same as mine it is easy to remove the black plastic cover. With the slideout out enough to access the plastic piece take a block of wood and place it at the bottom of the plastic and rap the wood upward with a hammer. I have not removed mine in some time and kind of remember a screw at the top of the mechanism that stops the plastic from coming off on it own so you have to remove the screw to allow it to rise about 2 inches or so and then you will be able to see the complete locking mechanism. There are some springs that return the mechanism so that it will not extend when the slide is out
I had to replace the springs and they were hard to find and if I remember correctly the company that made the locks does not make them anymore.
Good luck,
Paul