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