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