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Yeah you'll be fine. I'd be more worried about drinking from a plastic bottle than smoking with one.
This only applies during the curing process so don't worry about it as long as you wait a good day or so for it to dry completely.
They're essentially the same so go with price point to determine which to buy. That or color, as if that matters... I'd be willing to bet anyone...
If you taper the male end all the way from 18 to 14 you will likely not be able to fit it into 18 because of the extra length hitting the rest of...
Any 'shards' of glass from drilling could simply be washed away. I would clean the piece just to make sure the bit that broke off cant get...
My main question though is how are the connections regularly made?
One issue I've noticed with cheap 4pc grinders is the surface of the bottom piece that holds the pollen. Often on the cheaper ones the machining...
Do a search on YouTube. There's a few vids on repairing it with a blowtorch if ya have a regular old plumbing torch.
Sorry if this was asked before but I couldn't find anything on here about this with a search. How are the 14mm & 18mm glass on glass connections...