The notch is located between the first end and {TAIL ~ the annular flange} and houses {HEAD ~ a stem retaining ring} 
The notch is located between the first end and { TAIL ~ the annular flange } and houses { HEAD ~ a stem retaining ring }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD