If you can remove the screws, do so. then remove the servo arm from the servo and slip the wire out of the connector. You should now have the arm and connector out where you can work on them. First just try to carefully pry the retainer from the bottom of the connector. If that doesn't work, try using a Dremel with a grinder or cutoff wheel. Do not let the temp build up and melt the servo arm. Just cut the bottom part off the connector until it pops off the arm. Replace with one of the connectors listed in post #3 above or similar. Use the metal retainer clip for better grip of the pivot pin. I will use the plastic ones during setup sometimes but I NEVER fly them because they can come loose too easy.

I have to leave work for the day now. I'll check on your progress in the morning.

Good luck and just work slowly.