Lean left, and you go left. Tightening this nut compresses the urethane bushings, stiffening the action of the truck. Tightening the kingpin nut makes the board more stable, but makes it much harder to turn. Loosen it, and the board becomes floppier, but much easier to turn. Fausto Vitello narrates a video tour of the Ermico Foundry , where Independent Trucks and others are made.
Molten aluminum is poured into a steel mould, where it cools and hardens around the truck axle.
The truck is then removed, filed, polished, and packaged as a finished product, ready to grind . The most popular truck of all time, and the standard for the modern skater, was the Independent Truck. It was designed around the 1920's for ballroom roller-skate dancing,which had a big boom prior to the depression. The basic system for allowing a truck to turn is called the Chicago pivot, and all modern trucks are derived from that. What has changed in the Chicago Pivot truck is that we have refined the system to allow better turning, more stability, and certain other features that skaters demand.