Captive nut came loose HELP

Hi



When I was trying to change the battery on my Mk1 ZS 180, the captive nut beneath the battery tray that you use to fix the battery retainer, has came loose.



How easy is it to fix/remove as I need to remove the battery as it's completely dead and only holding the charge for about 48 hours



Any advise or tip would be gratefully appreciated



Stephen

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