its easy to change a keyboard that you can access from the outside.But how do you replace a keyboard that’s inside the laptop?

Like the dell inspiron 17 5000 5770. You have to take apart the laptop to get to the palmrest , were the keyboard is. The keyboard and the plate that is over it , is held by some plastic pins that go through the keyboard and plate. Those plastic pins have a sort of plastic ring (o shape) that you put on the pins to hold the keyboard. And no ,its not in your service manual . Anybody have replaced these kind of keyboards. Theres got to be a way , because , the keyboards are sold in many places. This is the puzzle. Know how?