In some embodiments, systems also include {HEAD ~ a reset protrusion} disposed on {TAIL ~ a distal end} of a flapper shaft connected to the flapper lever 
In some embodiments , systems also include { HEAD ~ a reset protrusion } disposed on { TAIL ~ a distal end } of a flapper shaft connected to the flapper lever
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH