Thanks. Right now I don't actually have a vice. As cheap as the pots are I'm not sure it's worth the trouble (for me, that is). It's usable as is, and I really think going down to the 1/4 qt smaller size will probably do the trick. The ever so slightly smaller wall diameter should create a bit snugger fit for the bottle, too.

Of course, I'll keep your suggestion in mind if I do end up just modding the one I have.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman