Beware that you pretty much need to flood the Hozan's head with oil, or it will wear out in short order. I keep a can next to the ones that I use, and a drop goes on right at the base of the rollers for every spoke. The large nut needs to be turned up or down the head, depending on the spoke you use, as not all blanks (or threaded spokes) are the same diameter, even if they are nominally. Noodle with a sample spoke until you can thread the nipples that you are using with no issues.
Just as an aside, I find that Wheelsmith blanks leave a ton of swarf compared to other brands when I am rolling them. The price of being inexpensive, i guess.