A pair of handles and a pair of toggle links are pivotally attached to the two arms for effecting {HEAD ~ a mechanical advantage} during {TAIL ~ the shearing and insertion process} 
during
A pair of handles and a pair of toggle links are pivotally attached to the two arms for effecting { HEAD ~ a mechanical advantage } during { TAIL ~ the shearing and insertion process }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL