The holes are covered by {HEAD ~ the wrap} of {TAIL ~ the other scroll member} for the majority of the operational cycle of the scroll compressor 
of
The holes are covered by { HEAD ~ the wrap } of { TAIL ~ the other scroll member } for the majority of the operational cycle of the scroll compressor
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH