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