The dowel pins {HEAD ~ 55 assist} in carrying {TAIL ~ the torsional loads} encountered during drilling 
The dowel pins { HEAD ~ 55 assist } in carrying { TAIL ~ the torsional loads } encountered during drilling
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH