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