I made one too, but I wonder if the tool specifically made for this has a larger ID of the tubing. Cutting an old line works, but I was surprised to see how thick the tube wall was! The reason I mention it is the pictures of the drip tool in the FSM look like the tube used was much thinner, and I wonder if this would make it easier to distinguish the transition to drip rate flow.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.