Exercise Bike

This guy sharpens knives, scissors, tools, whatever has an edge, for housewives, salons or restaurants. The bicycle has been modified so it has one wheel and a grinding stone mounted on the handlebars. He pedals to turn the grinding stone. When he is done, he tips the bike and pushes it down the street on its wheel, onto the next customer.

Knife sharpening is a tough way to make a living, very low pay. There is a saying that goes, you are as poor as the knife sharpener's dog who eats the sparks in order to have something hot to eat.