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What also came to my mind was my father telling me once that old Wilhelmshafen ship card models used an approximation for the thin gun muzzles, they did it as n-sided prisms or frustums. I think they had about 6 to 8 sides each. He mentioned that this was much superior to rolling tiny tubes and didn't look worse at such small radia. Perhaps that's an alternative. Even a 4-sided prism may be enough to get the impression right.
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