Eccentric insert

This chuck, marketed by Robert Sorby under the name "Wobble Chuck" (wobble = flutter, wiggle, sway, egg, tilt, ...) gives the wood turner the opportunity to experiment with a variety of offset turning techniques.
The chuck is designed for Sorby Patriot standard top jaws 50 mm, but also fits into other dovetail jaws of similar size. (see also dimensions in the illustrations). The workpiece is attached to the wobble chuck with a wood screw.

Wobble Chuck Video Part 1:

Wobble Chuck Video Part 2: