Don't blame you one bit...
So glassgal sent me some contact info, I'll give him a call Monday morning but there may be something to what she said about the shape of the bottle we're looking for... there may be a reason why they don't make square bottles i.e. structural integrity and the blow mold process and thin walls...a cylinder is a much more efficient shape. At any rate... I'm constantly ordering different bottles (they're cheap)... sooner or later I'll find my silver bullet... and again, thanks to rudy for opening my eyes to the flat top cap idea.
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I ordered 2 of the 4-4.5 ml bottles from Vapage to experiment with the mini & 18490. Should be here in beginning of the week. I update you on my fiddling findings!