{TAIL ~ The limit switch} 120 may be used to modify {HEAD ~ a threshold value}, as will be described hereinafter 
{ TAIL ~ The limit switch } 120 may be used to modify { HEAD ~ a threshold value } , as will be described hereinafter
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH