{HEAD ~ An edge} of the substrate 15 may also be engaged against the flat surface 58 to conveniently locate {TAIL ~ the substrate} in a proper position 
{ HEAD ~ An edge } of the substrate 15 may also be engaged against the flat surface 58 to conveniently locate { TAIL ~ the substrate } in a proper position
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH