Tweeter split in half - help!!!

Hello. I dropped my (very old) RCF dome tweeter from my desk. I suppose that the glue that held the magnet was old and dried up. It separed. Is there any way I can fix it ? I have 2 part epoxy (similar to JB Weld).
Here's a picture of how it broke. For now I've put it in a bag so dust doesn't get in the voice coil gap. I really want to fix this tweeter because it worked well before the accident.
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