{HEAD ~ A replaceable cutting element} is provided which is easily changed at the job site with {TAIL ~ conventional hand tools} 
{ HEAD ~ A replaceable cutting element } is provided which is easily changed at the job site with { TAIL ~ conventional hand tools }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL