means for adjusting the support and guide mechanism with respect to the power tool, said adjusting means operating to raise or lower the tool with respect to said support and guide mechanism to vary the extent of operation of said tool on {HEAD ~ the surface} of {TAIL ~ the workpiece} 
means for adjusting the support and guide mechanism with respect to the power tool , said adjusting means operating to raise or lower the tool with respect to said support and guide mechanism to vary the extent of operation of said tool on { HEAD ~ the surface } of { TAIL ~ the workpiece }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL