I was just about to post that handy tip. Always worked for me too.
Funny you should ask... I tried it with the standard 4mm airflow before installing the 1.8mm AF pin and it is the same. It comes with the same AF inserts as batch 1 (1.0mm/1.2mm/ 1.5mm/1.8mm).
Atmizoo sells the newly released "Tripod fixed air flow tubes kit targeted for RDL / DL vaping. Five tubes with air flow hole 2.0 / 2.2 / 2.5 / 2.8 / 3.0 mm" as an optional item.
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I think many RDL/DL vapers would be fine with the stock rta. The airflow can be closed off/customized from the 4mm AF with the AFC ring. However, I would grab the kit if I knew for certain that I wanted a specific airflow in the 2-3mm range.
I'm trying very hard to resist the urge of the Tripod. And those new RDL inserts ain't helping