Hey @Renneck ! I sand the female parts by standing them on a flat surface covered in 600 grit wet, wet-dry sandpaper. Simply hold the part down near its base and twist it around with a little downward pressure. Keep your hand, and the part in the same position rotating the part only a few degrees at a time. I repeat the process with 1200 and 2000 grit. Once that's nice and flat, screw it together with the adjoining part and sand the seam with a piece of sandpaper wrapped around it. It takes a minute to chase the male side deburing bevel down, but if you keep your pressure even along both parts there won't be any warbling. If you preplan your female side sanding, you can get your clocking done at the same time. I hope this helps! Good Luck on your seam hiding!

P.S. If you designed your chassis to slip out the back of the hilt, you could always skip the sanding at first and silver-solder the joint. Then sand down any overflow.