A process for the formation of a thread form in a substantially elongate member, wherein the thread form includes at least one rib spaced apart from at least one other rib along the elongate member and wherein the thread form has a relatively coarse rib spacing but a fine thread pitch. The first board being aligned pivots about a pivot pin, which is mounted on a mechanical plate at a first end of the board that is opposite to a second end of the board to which a first connector is mounted. When the fingertip moves, the image taken by the image pick-up element changes and the pointer displayed on a display screen is moved in a direction according to the movement of the fingertip. Besides, the plug-in module uses the inter-process communication mechanism and the dynamic linking library mechanism of the operating system of a host to exchange data with the simulator module and display a mobile phone operation interface so that the simulator module is able to support future plug-in module.