a second biasing means for biasing said {HEAD ~ guide member} in {TAIL ~ a direction} projecting from said head 
in
a second biasing means for biasing said { HEAD ~ guide member } in { TAIL ~ a direction } projecting from said head
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH