a small x-ray (See Chapter 9, the X-Ray Talking Drum, for more information.)

two #36 hose clamps (These are roughly 10″ long and are used on hoses 1 13/16″ to 2 3/4″ in diameter.)

a largish metal can, such as a 32-ounce coffee can or the large tomato or fruit cans used in restaurant kitchens

an 18″ screen door spring

a piezo element, such as a 20 mm 6.5 kHz piezo buzzer element, Digi-Key part #102-1126-ND

a 1/4″ mono phone jack (a guitar jack)

room-temperature vulcanizing rubber or silicone-based household glue