A riser may be used to provide the spacing between the cover and the taped lead frame assembly, so that {HEAD ~ the cover} does not contact {TAIL ~ the taped lead frame assembly} 
not contact
A riser may be used to provide the spacing between the cover and the taped lead frame assembly , so that { HEAD ~ the cover } does not contact { TAIL ~ the taped lead frame assembly }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL