The filler neck on mine had a hole(5/16ths) in the side of the neck, ( no flats on treads), not sure if factory or PO . I was going to tap the hole, an install a small axle breather cap, (Kinda looks like a mushroom) that will still give me a vent, and keep insects/ trash etc., out. Not sure what to use to lube the treads, but don't they make a "food grade lube" ? Toby
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