As {TAIL ~ the consumable part} 605 erodes over time, the gap 601 decreases until it disappears entirely, and another gap 602 begins to form between the surface of {HEAD ~ the consumable part} 607 and the go no go gauge 600 
As { TAIL ~ the consumable part } 605 erodes over time , the gap 601 decreases until it disappears entirely , and another gap 602 begins to form between the surface of { HEAD ~ the consumable part } 607 and the go no go gauge 600
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH