Toslink Connection Flakey

I just bought a PS Audio Superlink D/A converter on eBay in order to enhance my Airlink experience with an Airport Express. Unfortunately, the optical connector on the back of the Superlink is flakey and only connects when jiggled. There is a screw on the outside of the box that holds the plastic connector in place. After playing with the screw and a few jiggles, the intermittent signal stopped. Now, no optical signal.

Can anyone suggest a fix?