So I found all this out this morning before I left for work today. The pictures are as far as I had time for today but I'm assuming the barrel connectors require a tool that pushes in the retainers so you can remove them from the back side of the connector body.... Is that right?
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If you look at the pins sticking out, you will see there are 2 black tabs holding them in. To properly remove them you would use a tool like this from the backside of the connector. However, since you are replacing the connector, just use a small pick or pocket screwdriver and pry them or break them off.