There's Something Rattling in My Dryer Vent Tube

[stickmaker]

I've long had problems with the plastic ones coming loose at one end or the other, so this past Summer I put in an aluminum tube, and *screwed* it in place at both ends.

Now I have something blowing around in it. Even on high, it won't blow out. I may have to move the dryer and unscrew the tube to get it out and to stop the noise.

This is my punishment for being thorough...