My
>understanding is that the oil can be extracted simply
>by squeezing the olives inside somthing like a
>cheesecloth.
Yes it must be possible but the olive oil made since neolitic come in an
important proportion from the pit as well. on top of  the flesh ( i don't
remember exactly but i think it is close to 40 %) hard to squeeze the oil ou
of the pit without 2 big stones to crush them
jean-claude