On Sun, 30 Jun 2013 21:41:44 +0100, "Gazz" wrote:

It was a cylinder of mesh, i think it had a metal spider at one end, to
which it attached to the frame via a bearing, a motor to the side drove it
around like a cement mixer, cylinder on an incline... bung a shovel full of
mixed crap in the open end, it's rotated around and the muck drops thru the
mesh into a barrow below, and the good stuff falls out the back in a
separate heap.

Wonder if someone could make up a sieve barrel or a cement mixer, just pop
the cement mixing barrel off, pop the sieve cylinder on, away you go.

Every kitchen has one - or an old one lying outside, in many places.