Don't go with copper. Not because of the weight but 1) because the salt water will oxidize it over time and 2) because copper is at it's most expensive price ever right now. There was a report here in Rhode Island USA about thieves going under beach-homes (which are elevated a couple of feet off the ground to prevent damage in the event of a storm surge) and stealing all the copper tubing for their water systems. Crazy stuff. Not to pry but why don't you buy a polespear? I understand that they are not very expensive at all. Or do you just really want to build one yourself?
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“You should never be in the company of anyone with whom you would not want to die." - Frank Herbert
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