The invention relates to a plastic cartridge system including a cartridge having a plastic-covered column, said column including a monolithic sorbent and at least one closing cap which is applied to the ends of the column. Furthermore, by way of a feeler wheel, which is coaxial to the routing tool and which travels over a workpiece surface adjoining an edge strip, the rest is supported on the workpiece for follow-up of the routing tool according to a contour sensed. When the range of the torque variation detected exceeds a predetermined value, an engine torque is reduced by controlling the engine, and the automatic transmission is controlled to compensate for a reduction of the driving torque due to a reduction of the engine torque.