a two honing process eliminates the need for subsequent brush honing at another location . the honing process which is accomplished with a single head uses rough honing stones or tools for the initial phase , and finishing tools of tightly compacted abrasive containing plastic monofilaments for the second phase . the phases may be contiguous , slightly spaced , or preferably overlap for up to about one - half of the rough honing phase . when the finishing honing tools are operating alone , the angle of movement of the tools is somewhat askew of the oil retaining ridges and grooves formed by the rough honing operation . with the process , the oil bearing surfaces have improvements in plateau finish and surface topography , avoid abrasive contamination caused by hard finishing tools , and obtain such improvements in a more economic manner .