The universal joint facilitates {HEAD ~ slight misalignment} between {TAIL ~ the rotary shaft} and the drive shaft 
The universal joint facilitates { HEAD ~ slight misalignment } between { TAIL ~ the rotary shaft } and the drive shaft
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH