My one for the 1//72 scale .. just two pieces of glued together pieces of the stretched with the heat sticks from a mould sprue. I stretched them in the way to get two cones of different heights. Then I found the same diameter for both parts at the cone tips and cut them off. Glued together added the support ( also a piece of the stretched sprue ) and voila.
PS ... actually I also drilled the inlet and outlet of it.
PS ... actually I also drilled the inlet and outlet of it.