First and second hubs 15 and 16 are mounted on {TAIL ~ the hub support frame member} 13 for rotation about {HEAD ~ spaced generally parallel axes} 17 and 18 
First and second hubs 15 and 16 are mounted on { TAIL ~ the hub support frame member } 13 for rotation about { HEAD ~ spaced generally parallel axes } 17 and 18
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH