There is a chrome socket that inserts into the gray housing, what you are pointing to is the screw post that in addition to receiving the electrical power also holds the chrome insert into the housing and makes the connection to the heating element of the lighter. This picture may show it better (I have it disassembled) I need all pieces shown in the picture (there may be another ceramic piece as all I had left was pieces that had broken and turned to dust).
Thank you.
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