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That fly is probably fine. It is not uncommon for them to molt their wax with age. You may need to clean the fly and coat it with sensor safe RTV silicone to prevent arcing/corona.
I can't see the top or bottom of your socket well enough to say for sure how to get the old key way out. If the bottom is open you could try to push it through, if the top is all you can access you may need to reach in and grab it with pliers, if it is trapped in a hollow you may need to remove the socket or partially dismantle the assembly to get at it.
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