There may have been a circular ring of spring wire that acts as a keeper inside. I would think Minelab will fix it no charge if you get it to them. Otherwise find a similar connector from Digikey or Mouser (or maybe West Marine?) and find a way to swap both ring and spring. Be sure no damage to the black connector - it kind of looks like a torn thread on your photo. The whole connector is supposed to be replaceable but I've never looked into how it is done. If you need a quick fix and aren't going underwater, just plug it in and wrap the area with Loctite silicone tape from Lowes.
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