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How to simply attach screw in insulators for wooden fence posts to metal posts

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Hi there,

I have come across quite a few screw in insulators that are used for metal fence posts as well as some that look like this http://maskinaffaren.com/wp-content/uploads/2015/09/Super-najfri-isolator-15-123.jpg
 Does anyone have any ideas for a simple way to attach them to 16mm metal poles? Thank you!
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Long Drywall screws might work. They are case hardened and will thread into stovepipe so they might thread into metal fence posts. A fender washer might help in keeping the crews from going through the insulator.

If that does not work, you might try long pop rivets.
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Location: S. Ontario Canada
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Drywall screws won't last long in the elements, look for something made for outdoors, coated or plated.  
Look for self drilling screws. They have an auger type nose that will drill through light metal but they're a bit pricey. If the metal is thick it could dull the point before breaking through. Self tapping screws are hardened and the threads will cut into metal. Cheaper but you will need to drill a pilot hole to get the point started.
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