RT3000P repair question

Hi all, I'm new on the forum and needs you help. I have a RT5000 system and my RT3000P's subwoofer drivers are giving me headaches. I picked up with extreme bass during movies, there was a vibration/distortion in the bass sounds. I opened the up and saw that due to their age the spider came lose from the magnet. What are the best ways to repair this. I stay in Namibia 🇳🇦 so we don't have a Polk repair Centre. Any guidance will be appreciated. Many thanks in advance.

Answers