Anthony Gallo Reference3: Loose Speaker Globe

Hello, I'm looking for some sound advice. I have a pair of Anthony Gallo Reference3 speakers that have been sitting in the same spot for a couple of years. I went to move them for the first time, and noticed that one of the two speaker globes (ie. One of the two, round, 'silver' colored speaker balls) on one of the towers is loose. The sound does not appear to be effected by this loose globe, I just think it's something that I should tighten; in order to keep it from becoming a problem down the road. Can any of you offer advice for how to tighten the speaker to the tower's upright section? If it's something I can do, I'd like to give it a try, instead of going through the hassel of shipping this in for the repair. Looking forward to reading your suggestions.