When casing 301 a and {HEAD ~ 302 a} are installed into {TAIL ~ said mounting brackets}, the optics within said casings can be automatically returned to a position that does not require realignment 
are installed into
When casing 301 a and { HEAD ~ 302 a } are installed into { TAIL ~ said mounting brackets } , the optics within said casings can be automatically returned to a position that does not require realignment
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH