a second opening in {TAIL ~ surface portions} thereof longitudinally spaced from said first opening and {HEAD ~ toward said free extremity}, 
a second opening in { TAIL ~ surface portions } thereof longitudinally spaced from said first opening and { HEAD ~ toward said free extremity } ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH