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Very nice build, but it seems awfully overbuilt (1/4 inch material) and subsequently heavier than it needs to be for such a small trailer with such a small load potential. What was your max load goal, and how much weight did you think the tongue would have to support given that the tongue should support 9-15 percent of the gross trailer weight? Did you use a 2000lb or 3500lb axle? Thanks! I enjoyed the article, and enjoyed the pictures.
Actually, copper work hardens. Heating to red hot then rapidly quenching in water will "anneal," or soften the copper again.