1, if a hard rod, then you can pull the pole several times, making the air inside and greases can be mixed, reducing the volume of a single bubble Perhaps the problem will be resolved.
2, the most effective way is to put the gas method, but this requires hardware support, some exhaust port of the gun design, when you slowly open the exhaust when the air inside the screw will come out. Some Grease Gun exhaust screw structure but can not rule out the gas, I transform it with a tiny, screw it to punch a hole or use a saw to open a slot, so that when you slowly loosen the screws When the gas inside the yard will be able to come out from this slot. Of course, if there is no such innate structure you can get through their own transformation.
3, the last one skill, time-tested, merits, when you think there can not be played when the gas simply by turning the gun body and pump oil binding wire port or a few back and forth a few times (it is best to turn side edge pressure) , ensure your success. Truth is not difficult, is that when you turn it, in fact, the gas inside the bubble is also turning to another site, the original site of the oil fill, so the problem will be solved.