To build this brilliant “bookmobile” - crafted by Halligan Norris Smith and featured in Grace Bonney’s Design*Sponge at Home ($21.24; barnesandnoble.com) - search a commercial salvage yard or sites like eBay for a wooden cable spool (usually under $50). You’ll also need about 12 three-quarter-inch-thick wooden dowels that measure at least as tall as the spool when it’s lying flat on either wheel.
Lay the spool on one of its wheels, then use a ruler to measure the distance from the top of the top wheel to the top of the bottom wheel. Use a handsaw to cut the dowels to this size, then sand the spool and dowels.
Measure the distance from one wheel’s outer edge to the spool’s core. Divide that number in half.
Beginning at the outer edge of the top of the top wheel, measure in the distance computed in Step Three. Mark with a pencil. Repeat around the spool’s circumference, spacing marks an equal distance apart.
At each mark, drill all the way through the top wheel, using a three-quarter-inch spade bit. Then, with a hammer, drive a dowel into each hole, until the dowel’s bottom is secured against the bottom wheel. Paint spool and dowels, if desired; let dry.
Step Six: Evenly space three casters ($12 for five; ikea.com) in a triangle pattern atop the top wheel, placing each caster about an inch in from the edge, and drill into place. Flip the spool over and you’re ready to roll.
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