In {HEAD ~ the illustrated embodiment}, {TAIL ~ the so formed weighting} means 22 is detachably arranged at the casing while being preferably exposed 
In { HEAD ~ the illustrated embodiment } , { TAIL ~ the so formed weighting } means 22 is detachably arranged at the casing while being preferably exposed
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH