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