We build pond yacht masts the easy way. We have something resembling a spar lathe, made from 1x stock. Rip a square length of red cedar (or spruce) of Appropriate Size. Chuck it into a half-inch drill. Insert into mast lathe.
Spin. Take a piece of 80 grit sand paper in on hand and grab hold of the workpiece. Take to to round.
Once that's done, work the ends of the spar to get the disired tapers.
Finish up with finer sandpaper and the finish of choice.
You would not enjoy Nietzsche, sir. He is fundamentally unsound. — P.G. Wodehouse (Carry On, Jeeves)