Place the sealed-shut cardboard box, stepping stool, brick, or block of wood on a table, or on the flat, firm floor.
Lay the flashlight on its side on top of the cardboard box (or other object) and line up the edge of the flashlight so it is close to the edge of the box. Use masking tape to tape the flashlight down so it cannot roll around. Your setup should now look like the one shown in Figure 3, below.