Caster board
A caster board or vigorboard is a two-wheeled, human-powered land vehicle. It is somewhat like a snakeboard. Other names are waveboard and RipStik, both associated with commercial interests.
A caster board has two narrow platforms known as "decks" that are joined by a "torsion bar", which consists of a metal beam, usually coated by rubber, that houses a strong spring. One polyurethane wheel is mounted to each deck with a caster so that that each wheel can steer independently, and each caster has a steering axis that is tilted about 30° back from the vertical.
Movement
Because of the construction of a caster board, riding one (or "caster boarding") is more akin to snowboarding or surfboarding than skateboarding. The stance is perpendicular to the board, and the feet do not need to leave the board to propel it. While riding, one can also carve back and forth, making heel-and-toe side turns (see steering). Initially, one places the front foot (depending on preference) on the front of the board, which is generally unidirectional. Once on the board, and riding, the independent motion capabilities of the front and back of the board allow it to twist along the lengthwise axis. This lets the rider turn or even propel the board forward without removing his or her feet from the board.
Dolly (tool)
A dolly is the name given to a category of tools used in shaping sheet metal. In general, a dolly is a solid piece of metal, small enough to hold in one hand, with a curved or shaped face. Generally a dolly will have more than one surface, each with its own radius of curvature (much like a three-dimensional French curve), allowing the craftsman more flexibility in using the tool.
A dolly can be used either as a hammer, shaping the metal to match the curve of the dolly, or as small anvil to provide a curved surface over which to dome or dish metal. They are commonly used to shape sheet metal in auto repair, especially in locations where it is difficult to swing a hammer.
They can also be used as backers for upsetting metal. When used as a portable anvil, a dolly can be used to hold a rivet in position while it is being clenched with a "snapper". Such dollies are commonly cylindrical in shape, and rely on mass to work. The act of using it is known as holding up or holding on. Dollies can also be used in boat building, when clenching nails. See clinker (boat building).
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