So, my Xfire needed a new CPS. I ordered a new one, had all the right tools, and proceeded to change it today as the new one came in. Taking it out wasn't too bad, too me a few minutes but I've done harder things. I then went to put the new one in, guiding it into the socket along with the screw. The what I feared happened, the screw fell out...not into the abyss of the engine bay, that would have been great as it probably would have hit the floor. Rather, its lodged in between a small corner/orifice between the heat shield and engine. I can barely feel the tip of if with the tips of my fingers. I tried everything to get it out, magnets, different needle pliers, nothing helped, its really stuck deep in there.

My question now is, since the CPS sits really tight into its socket, would it be safe driving with it without the screw? Any other ideas for anchoring it in place? Or where I can get a replacement screw?