You say tile saw or tile bit. If you mean those spade shaped things, I'd recommend diamond hole bits instead. They have fairly decent ones on amazon, 10 for about $12. And then practice, practice, practice on some sacrificial mason jars. Drilling holes in glass can leave micro fractures that might give you more trouble with the vaccum. Or the araldite could help with that (if you use it to seal the tubes to the jar) but I don't know, never used it.
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Rebecca
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