The method 1, wherein {HEAD ~ the step} marking {TAIL ~ step} involves marking the shank hole location with a marker 
The method 1 , wherein { HEAD ~ the step } marking { TAIL ~ step } involves marking the shank hole location with a marker
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH