Accessory Parts definitions and replacement instructions

I have a few questions about ordering and replacing parts for my Atlantis 2 Tank....

1) Where exactly is the "Connector and insulating ring"? Am I correct in assuming that it is the piece in the bottom of the "Base Hardware" that sits inside the treads?
2) Does the "Base Hardware" come with a seal gasket, connector and insulating ring, or do the three pieces need to be bought separately?
3) Are there any videos and or instruction forms that show you how to remove/replace the connector and insulating ring?

Thanks for any help!
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