A method and apparatus for removably attaching a controller onto a portable electronic device to control the operation of that device and, more specifically, to a joystick and button controller which is removably attached to the device that communicates through software with the device and is connected to the device by wire or wirelessly. In a method of forming a wafer-level camera with a mechanical fine focus assembly, the lens base and the lens acceptor rotationally couple to join the lens stack with the sensor, and to adjust z-height of the camera module to achieve optimal focus. After processing in the micro vortex mill, the products supplied to the oil reactor produce high product yields with shorter reaction times, thereby substantially improving the economic benefits of the process.