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