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They just welded a small piece of scrap metal (about the size of two cooked grains of rice laid in a row) to the pin itself. The pin pretty much comes straight out when you pull on the metal with a pair of pliers.
I wasn't there for the actual welding part so I honestly have no idea how they got the metal to stick to the pin but if your old man's into welding then I imagine he should have no problems.
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