A switchable free-wheel arrangement for a CVT transmission of a motor vehicle. Specifically, the disclosure relates to row treating units incorporating a row clearance arrangement or a combination of tools that includes a row cleaning device and a soil penetrating coulter device. The process also includes a screening operation of the various species produced in each electronic cyclotron resonance zone to enable exclusive access of CxHy\xb0non condensable free radicals produced to access a deposition zone adjacent to at least one part of the substrate including the two electrically conducting elements to make the nanotube.