Instructional diagram of a wooden derby car's elastic suspension frame with labeled components including balloons, twine, toothpicks, bobby pins, and an egg cradle.

“Clean instructional cutaway diagram of a wooden derby car interior. Step 2: Elastic Suspension Frame. Show two balloons tied end-to-end forming an elastic suspension line. A cotton twine runs through the balloon knots as a safety tether. The elastic line is stretched horizontally between two wooden toothpicks spanning the car width. Toothpicks are anchored to the car body using bobby pins. An egg cradle hangs from the elastic line using paper clips. All components remain attached when inverted. Add labels: ‘Elastic Balloon Line’, ‘Twine Safety Tether’, ‘Toothpick Crossbars’, ‘Bobby Pin Anchors’, ‘Egg Cradle’. Simple instructional style.” See more