Rot Lot Dai (Thread-Spool Crawler) — a Thread Spool with a Rubber Band Through It, a Short Stick Across One End and a Thin Bamboo Winder at the Other; Wind It Tight, Set It on a Smooth Floor and It Rolls Away

"The twisted rubber band unwinds, driving the spool forward until the twist runs out." (Sirindhorn Anthropology Centre, author not named, CC BY 4.0)

Push a rubber band through the hole of a thread spool.

Snap off a short scrap of wood and lodge it across the hole at the opposite end.

Push a thin shaved bamboo stick through the rubber band and turn it in one direction until the rubber is twisted tight.

Drawings of the rot lot dai (Sirindhorn Anthropology Centre, author not named, CC BY 4.0)

Set the spool down on a smooth wooden or concrete floor; the rubber unwinds and the spool runs forward until the twist runs out. Children race them to see whose goes furthest.

The name comes from the thread spool that runs like a car. A stick or a chicken feather can be used as the winder. Source: Sirindhorn Anthropology Centre, Traditional Objects of Everyday Use database, "รถหลอดด้าย", author not named (CC BY 4.0 licence). **Limits** The source gives no sizes. The illustrations are drawings. There is no product line for an empty thread spool.