Applying a slight downward pressure on the squeegee support causes the rubber edge to press against {HEAD ~ the flat surface} of {TAIL ~ the crystal wafer} 
Applying a slight downward pressure on the squeegee support causes the rubber edge to press against { HEAD ~ the flat surface } of { TAIL ~ the crystal wafer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL