It allows one extremity of crank arm 6 to reach {TAIL ~ the interior} or drum 5, where it connects to crank handle 5 via {HEAD ~ an articulated joint bearing} 17, as illustrated in FIG 2 
It allows one extremity of crank arm 6 to reach { TAIL ~ the interior } or drum 5 , where it connects to crank handle 5 via { HEAD ~ an articulated joint bearing } 17 , as illustrated in FIG 2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH