It is also contemplated in this embodiment that {HEAD ~ the pen cartridge} may be extended as {TAIL ~ a result} of a pressure applied to the edges of the housing 
extended as
It is also contemplated in this embodiment that { HEAD ~ the pen cartridge } may be extended as { TAIL ~ a result } of a pressure applied to the edges of the housing
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH