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