{HEAD ~ the second spacer} including a spacer spring, {TAIL ~ a spacer spring insert}, and a piston 
including
{ HEAD ~ the second spacer } including a spacer spring , { TAIL ~ a spacer spring insert } , and a piston
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH