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