- 1). Poke two holes in the top of the lid, one on each of the lid's sides. These are for the nail and wire. The hole for the wire should be small enough to hold the wire in place when the lid is moved.
- 2). Wind the wire around a pen or pencil until 3/4 inch is left unwound. Remove the wire and bend the unwound section so that it points upward when the coil is held vertically.
- 3). Hold the lid upside down and insert the wire into its hole. Flip the lid face up and insert the nail into its hole. Check the spacing between the nail and wire. If they are touching, shift them so that they don't.
- 4). Fill the cup half-way with vinegar. Fill the cup the rest of the way with water, leaving room 1/8 inch from the top.
- 5). Place the lid onto the cup. Take two leaders and attach one to the nail and the other to the wire.
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