Step 4Check the fit of the lid
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Key to the success of this extraction is the properly assembly of your extraction apparatus. It's important that the handle of the glass lid be the right shape to facilitate the vapor collection. One that comes to a nice point will act as a "drip tip" and is perfect. It's also important that the drip tip has a little bit of clearance over the top of the glass, at least 1/2".
Before actually starting with the catnip, do a trial run by filling the pot just with water to make sure you can distill effectively.