Instructables

Step 6: Pendulum Production

Straighten a 3" piece of thick copper wire.

Strip 1" of insulation from one end.

Strip 1/2" of insulation from the other end, and bend into a loop.

Melt/burn/cut away the insulation from an 8" length of thin magnet wire.
Solder it to the bent end of the thick copper wire.

Solder three guitar string "ferrules" to the other end of the copper wire. They grab the solder quite well when heated a bit! If you don't have a source for these, use something else: a big solder blob will serve, all you need is a little weight.

Make four of these.
 
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