what is this odd little thing?

By David Robbins; posted February 23, 2019

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the bottom(?) flare is about 2 1/4" diameter and its about 2 1/4" tall, hollow, with this rectangular protrusion on one side. it is from a 2 piece mold, and is rather crude with bubbles and rough edges.

ok, so this is a lightning rod wire insulator. it would have been mounted on a screw in clamp and i assume the wire went through the middle.