I included the pz2 to zero the origin because rreynolds said:

Quote - It would be nice if Poser had a command that would zero an object's origin...

And in deed this can be handy, but it should be noted that whilst zero is sometimes the best place for the origin, this is by no means always the case, It will depend on how the prop was made, and what it is. In genral, with a weapon or utensil, the origin should be at the place where the hand will grasp it. With a sword this will be the middle of the hilt, with a spear somewhere near its center, with a hammer somewhere near the end of the shaft. These positions may, or may not corrispond to zero, depending on how the item was made. The point being that the origin is what the prop will pivot round when you use its rotation dials.