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ew... polystyrene.
So why not find a nut that fits inside the hex on the plastic cap snugly, and use whatever size threads that nut would have? I'm really thinking that a carriage bolt with a slot cut in the head would make a great pan screw here...
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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