First the disc is heated on a hotplate of some kind such as an upturned iron. Alternatively a large soldering iron can be used. Hot melt stick or film adhesive is applied and melted. The disc is picked up with pliers and placed on the wood then allowed to cool.
The project is then turned in the chuck and the disc removed by re-heating.
The sticky chuck was developed by Jack Cox - you should read his book "Beyond Basic Woodturning" where he describes in detail the use of the sticky chuck system - not only for general gripping of small projects but for precise accurate work (he specialises in intricate laminated or built up turnings).
Sticky chucks are available 1,3/4" diameter or 2,1/4" diameter. The small one is capable with care of holding a 7" by 2" bowl or equivalent. They come with a small roll of glue film and instructions.Sticky Chucks on sale in our online shop.