{TAIL ~ The threshold force} is adjustable by changing the axial position of {HEAD ~ the compression spring seat} 
{ TAIL ~ The threshold force } is adjustable by changing the axial position of { HEAD ~ the compression spring seat }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD