{HEAD ~ A press block} is engaged against the gasket to fully enclose {TAIL ~ an active volume} between the press block, the peripheral walls of the central opening in the gasket, and the active surface of the substrate 
{ HEAD ~ A press block } is engaged against the gasket to fully enclose { TAIL ~ an active volume } between the press block , the peripheral walls of the central opening in the gasket , and the active surface of the substrate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH