Impact seems to work better than pressure. For some reason, a drastic change in the amount of pressure that is applied seems to work better for breaking things loose. I am not sure if the axle puller tool will really provide that, though. I think that the best bet is to loosen the nut, and whack on it HARD with the biggest f'n hammer that you can find. Don't whack the end of the halfshaft, though, as it will mushroom out, and need to be cut.