The printing pins or {HEAD ~ wires} are abutted against {TAIL ~ a movable membrane or bellows portion} of the container, so that container expansion effects linear movement of the pins or wires 
are abutted against
The printing pins or { HEAD ~ wires } are abutted against { TAIL ~ a movable membrane or bellows portion } of the container , so that container expansion effects linear movement of the pins or wires
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH