If the handle and {HEAD ~ barrel} are molded as 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 {TAIL ~ the diameter} of the outside surface of the device uniform 
If the handle and { HEAD ~ barrel } are molded as 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 { TAIL ~ the diameter } of the outside surface of the device uniform
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH