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