A dust removal unit includes an adjustable axial depth stop for an at least partially rotatable hand tool device with a radially displaced, rotationally fixed, telescopable, axially limited movable suction tube assembly with a suction tube running parallel to the axis of the tool device and coupled at one end to a suction head. More generally, a distributed processing technique and associated method are disclosed for analytical processes that require access to a massive database. The ethylene product may be reacted in the presence of an acidic catalyst to produce a liquid, a portion of which will be predominantly naphtha or gasoline.