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