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COIL. For the tubing, use copper or aluminum. Wind about 300 turns of wire around the tubing.
When you’ve finished, wrap some tape around the
entire assembly so it won’t come apart.
ROD AND SUPPORT. Make the rod by cutting a 2” section from the middle of the 8-penny nail and filing off any sharp edges. Then lay a 3” piece of elastic thread next to the rod, side by side. Tape them together at one end, as shown. Now lower the rod, taped end pointing down, into the tube until only l/2” sticks out the top. Place the remainder of the elastic over the edge of the coil, and fasten it securely with tape.
INSTALLING THE LOCK. Cut a metal strip 3” by l-1/2”, and form it around the coil. Bend the ends outward, and punch two holes in each end to receive the nails.