In a large bowl, mix the flour, arrowroot, nuts and cinnamon. In a cup mix the oil and water. Blend in the flour with a fork. Stir until a ball can be formed. Add more water if nec. Oil a 9" pie plate. Either pat the dough into the plate or roll between 2 pieces of wax paper. Handle it carefully - its fragile. Prick with a fork. For an unfilled crust bake at 400 for 12 - 15 min. Cool before filling. Filled crust - bake empty shell at 400 for 3 min. Then add filling and bake as reccommended.