a blade hammer on {HEAD ~ a root portion} of {TAIL ~ said blade} engageable with a blade support to position said blade in the run condition, and 
a blade hammer on { HEAD ~ a root portion } of { TAIL ~ said blade } engageable with a blade support to position said blade in the run condition , and
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH