{HEAD ~ The gyroscope} is mounted within {TAIL ~ the housing}, e.g., in the handle portion 
{ HEAD ~ The gyroscope } is mounted within { TAIL ~ the housing } , e.g. , in the handle portion
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH