Jim: 
While researching briquette presses for fuel production, I stumbled on an article about using similar presses for extracting oils from seeds and nuts. In this case, the focus was on bio-diesel production, but I felt it was helpful for other uses as well. We preppers often hear of the importance of fats and oils in the diet, along with the difficulties in storing these items, so having the means to produce your own is a benefit.