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