The motor 20 is enclosed within a casing 23 which has {HEAD ~ a downwardly depending pin} 231 pivotally connected to {TAIL ~ the other end} of the oscillating arm 24 
pivotally connected to
The motor 20 is enclosed within a casing 23 which has { HEAD ~ a downwardly depending pin } 231 pivotally connected to { TAIL ~ the other end } of the oscillating arm 24
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH