The other end of {TAIL ~ the arch block} is supported on {HEAD ~ a spring} in a blind hole in the arched notch 
The other end of { TAIL ~ the arch block } is supported on { HEAD ~ a spring } in a blind hole in the arched notch
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH