A flat piece would smush into the bottle opening too, no?
It would/does.
But the Smush Alignment Factor (SAF) is directly proportional to how Perpendicular the Flat Disk mates with the Bottle. There is also the Fall-Out Syndrome I mentioned earlier.
Trust Me... Poly-Caps are the Way to Go.
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Could have been - since I only paid $.99 per bottle an $.17 per cap:
)
WHERE ? ? ? ? How's the quality ? ? ? ?