I've got a 3 door punto sx. I've reupholstered the door side panels in the front of my car, but don't know how to do the back, as there is only a small circle of material within the door (no door just side as its only a 3 door). But unlike the front you can't just take the whole side panel off as it's connected somewhere i don't know. Do I have to take the whole inside off, or is there a secrect screw that would allow my to knock the circular material out and just replace it with another. As i don't want to do a botch job and have to stick a piece of material it over.