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Sometimes, in plumbing one must weld on the spot a vertical pipe end having on one side a nest and on the other a beaten collar and its free nut which of course must be placed at the top !!! The problem is to hold this nut so that it does not interfere when welding the socket. It is then necessary to manufacture a pin in piano wire, to realize it one winds the piano wire around an axis some but not too big (copper tube for example), one turns to have a double "O" having two paws. The two legs will be cut about 3 or 4 cm from this O, to the same length, then the tip of each of them will be bent at 90° to about 3 mm. So you have a staple that you fix in the thread of the nut, which then bears on the beaten collar.

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