I recommend two "Cliffy" protectors (www.passionforpinball.com) to keep your "Elvis" looking new:

First, install the Shooter Lane Ball Eject Protector (see pictures), and second, install the magnet protector. I even covered the magnet protector with a small circle of mylar, but it isn't necessary.
elvisejectdamage1.jpgelviseject2.jpg

If you haven't done it already, install clear flipper button protectors or you risk wearing down the artwork on the cabinet. It wears off and reveals a white base coat, which is not pretty. Almost all of the routed Stern pins that I've seen from this era have this wear. If the paint is already worn there you can get the black protectors, and they look sharp too.