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