Not saying this is a bad thing to try, and it is a perfect fit, I just have to wonder how accurate of a "test" it really is with all of the added volume in there. Any changes HAVE to be impacted by that as well, and not "just" the airhole size and placement...
Not saying its a bad thing to try, but not reliable enough IMO to make a call on to drill, or not to drill.![]()
One can also use a 10ml bottle, but yeah, extra volume would effect vapor coolness, flavor, etc.