- 1). Examine both axles for burrs or other protrusions from the manufacturing process.
- 2). File the axles smooth with a hand file or use a stone bit in an electric Dremel tool.
- 3). Smooth each axle further with fine-grit sandpaper or a Dremel tool grit wheel.
- 4). Add a daub of steel polish to a cotton swab and polish the length of each axle.
- 5). Dip the tip of a pipe cleaner in steel polish and push it through the center hole of each plastic wheel that comes with the Pinewood Derby car kit.
- 6). Insert the axle through the wheel and check for movement and friction before installing on the car.
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