{HEAD ~ The connecting block} 3 is associated with vertical guide rails on {TAIL ~ the front} of the main body 1 so that it can be moved up and down 
{ HEAD ~ The connecting block } 3 is associated with vertical guide rails on { TAIL ~ the front } of the main body 1 so that it can be moved up and down
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH