That Sampsas solid container (-38c one) had center pole when i designed it but i wasnt able to do it with the lathe blades i have. Its much more clever to make just 5-10cm long base since it requires less material and machining is easier (less vibrations due shorter "arm" of the blade).
I know that design is not very easy to make (at least if holes have to go 18cm deep like in those my containers) but its doable and i think it would kick ass (even though i would go bigger diameter than 50mm).
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