If the handle and {HEAD ~ barrel} are molded as {TAIL ~ a single piece}, there may not be a need for a casing as shown in FIGS 2 and 2B. A casing 4 surrounds or envelopes the barrel 3 to keep the parts and components in place and to keep the diameter of the outside surface of the device uniform 
molded as
If the handle and { HEAD ~ barrel } are molded as { TAIL ~ a single piece } , there may not be a need for a casing as shown in FIGS 2 and 2B. A casing 4 surrounds or envelopes the barrel 3 to keep the parts and components in place and to keep the diameter of the outside surface of the device uniform
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH