A mold is cut in {HEAD ~ the form} which is filled with {TAIL ~ compensating material} for forming the filter 
A mold is cut in { HEAD ~ the form } which is filled with { TAIL ~ compensating material } for forming the filter
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH