A conductive paste which can form a silver layer and a printed wiring board having a silver layer formed of the conductive paste. A skewer assembly with a thumbnut is securable to the wheel assembly with a quick-release assembly. A physical relation connecting the turbocharger speed to a pressure ratio of the fluid flowing into and out of the turbine is then defined. A substantial amount of the compound that is capable of stabilizing the bitumen in the organic solvent is recovered with the clay particles, while the bitumen is released.