I tried making an OT-34 flamethrower tank and had the same problem. With the method you used for the Hetzer's gun, I could get some flames to appear, but it didn't look good. It might be possible to make something with the FX editor, but I haven't used that before. What about you?
I have never used Fx editor before either. I will look into it tomorrow, I can only stay focus for so long.

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