This intermediate layer is not part of the gel or membrane and is sufficiently pliable to compensate for any irregularity in, or misalignment of, the cutting edge of {HEAD ~ the cutting tool} relative to {TAIL ~ the gel} or membrane 
This intermediate layer is not part of the gel or membrane and is sufficiently pliable to compensate for any irregularity in , or misalignment of , the cutting edge of { HEAD ~ the cutting tool } relative to { TAIL ~ the gel } or membrane
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH