Therefore, the pushing lever 64 is securely inserted into {HEAD ~ the space} between {TAIL ~ the two movable stockers} 
between
Therefore , the pushing lever 64 is securely inserted into { HEAD ~ the space } between { TAIL ~ the two movable stockers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL