Not usually unless its an uncommon or rare insulator. Super common ones like yours pictured it wont really make any difference in collectibility or monetary value.
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Soak it in water to soften the wood up. Then either spin it out with a big flat head screw driver or gently take it out piece by piece
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Its a mild acid, you can use the solution until it gets dirty. Had my bucket for 4.5 years, only got rid of it because i moved.
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For starters it was never a powerline. It was a very low voltage line, just enough to send and receive telegraphs, later they used then for long distance telephone. Wasnt worth it for them back then to remove all the lines.
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Not necessarily. When they abandoned the old lines they didnt go around pulling the old wires off the poles. Some still have the old copper in the air or partially in the air
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I made one out of an adjustable 24 foot painters pole. Put a rubber foot off a cane on the threaded end to spin the insulators off the pin. Wrapped it in camo gorrilla tape so it didnt stand out too much.
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Nice pieces. The first one is a CD257 made by Hemingray, its known as a "Mickey", second is a Brookfield CD102 Pony, the purple one is a commemorative issue, more than likely made for a national show. The commemorative more than likely is in the guide with an SI number, SI stands for Special...