Open a box, find a factory. Follow some instructions, mix some concrete. Put it all together. Turn the handle. It's very little work, even for older people. Each mini-factory comes with enough metal parts to make 4 machines. Then you can get a local welder to make you up some more. This machine will process . . . . .
Peanuts: Every year, in Africa alone, women spend about 4 billion hours shelling peanuts by hand. For many of the poorest families, peanuts are the only protein they can afford. For many they a crop of choice to take to market, but they have little value in the shell. And a sun-dried, unroasted peanut in the shell is much tougher than the roasted-in-the-shell kind wealthy people buy in the supermarket. 1 kilo or a little more than 2 lbs an hour is a normal shelling rate. And women, through their skin, can absorb the very toxic aflatoxins that can develop on the outside of the shell.
The Full Belly Project's award winning (Popular Mechanics, MIT) Universal Nut Sheller does peanuts at the rate of 50 kg/hr (120 lbs/hr). Adjustable for any size of nut. Because of their softer shell, aflatoxin contaminated peanuts tend to pass through unshelled for easy sorting.