The donut lining has a permanent place in art turning (Chinese balls!). It offers the possibility of evenly distributing holes or simple circular ornaments on the surface by spanning a ball several times. The donut food is a typical home-made food because its shape and size are determined by the size of the object being exciting. That's why making it only really makes sense when you need it. However, it is definitely worth saving a chuck once it has been made for later reuse, because it can - within certain limits - be adapted to new tasks: (lengthening or shortening the spacers, enlarging or lining the recess for the workpiece holder).
I myself have (so far?) only dealt with art turning in a “theoretical” way: I have literally “devoured” relevant books by Hugo Knoppe and David Springett as well as various specialist articles in the Deutsche Drechslerzeitung and the conversations with Hans Hofer and his work will last forever keep in remembrance! In order to be able to show at least one of my own typical application examples for the donut lining, I provided a small wooden ball with holes evenly distributed over the surface and then turned the ball hollow step by step through these holes.