Originally Posted by Janis

Jon, the cap is plastic. I have the top of the cap and it has just a couple of rounds of thread on it. The rest of the cap is screwed in flush with the metal square around the spring. I have not tried to move the spring, but have used the edge of a screwdriver on the plastic part of the cap to see if I can get it to move, and I can't. I could try a heavy needle to see if it will budge it at all. I'm thinking that the best thing to do is to either leave it taped, which is temporary at best, or glue the cap down on the thing. I'd be very careful about the glue if I did that as I know I don't want it to get into the spring area.
You aren't talking about putting the screwdriver in the square metal part around the spring, are you? The metal isn't part of the plastic screw, is it? I figured it was part of the motor unit.