Handy tip if using threaded rod. When you joint up, get the handle joint as flat as possible using a flat surface, eg the work bench. Turn it around to see if you are happy with the angle, glue in metal rod. Drill out the stick, slightly concave the top of the stick from the drill hole to the bark. Then when you decide on the best position for the head trim away the bark edge that is touching until no day light shows through the joint,
PS Tape the top of stick, mark the handle and the stick with a pencil line, so they always go back in the same place when you are dry fitting.
Dave