Noticed Tower is rattling when folded down and gets bumped (I'm thinking more than it used to but....). Section at "2" moves back and forth if the tower is bumped and rattles. However, I don't know if that tranfers to a problem when the tower is put up and tightened down with the bolts. Question: does the screw at "1" need to be tightned periodically? Further, will tightening the screw reduce the rattle? Before I touch anything, thought I might ask. Thanks.