a hollow bladed shaft keyed on {TAIL ~ the driving shaft} to rotate in {HEAD ~ said mixing bowl}, 
a hollow bladed shaft keyed on { TAIL ~ the driving shaft } to rotate in { HEAD ~ said mixing bowl } ,
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH