{HEAD ~ The casing} 2, wherein said grasping means comprise downwardly extending plate like projections from said upper casing sidewalls at the rear location of {TAIL ~ said upper casing} 
{ HEAD ~ The casing } 2 , wherein said grasping means comprise downwardly extending plate like projections from said upper casing sidewalls at the rear location of { TAIL ~ said upper casing }
HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL