The resin case is sandwiched by {TAIL ~ an upper yoke} and {HEAD ~ a lower yoke} 
The resin case is sandwiched by { TAIL ~ an upper yoke } and { HEAD ~ a lower yoke }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD