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