{TAIL ~ The housing} is further formed with a cylindrical cavity, and a manually rotatable hollow cylinder is received within {HEAD ~ the cylindrical cavity} 
{ TAIL ~ The housing } is further formed with a cylindrical cavity , and a manually rotatable hollow cylinder is received within { HEAD ~ the cylindrical cavity }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD