You remove the screw that makes the centre of the external positive connector of the 510 pin, then unscrew the build deck from the base. This then reveals the internal positive connector screw that also makes up the airflow.
It's possible to alter the tightness of the internal positive connector/ airflow screw and alter the airflow further. Just snug with a little movement of the positive terminal on the build deck gives you the least resistance, really snug with no movement of the positive terminal on the build deck gives you the most.
I only found this out myself by accident @Daniel Forsyth, after cleaning and rebuilding a few times.
It's possible to alter the tightness of the internal positive connector/ airflow screw and alter the airflow further. Just snug with a little movement of the positive terminal on the build deck gives you the least resistance, really snug with no movement of the positive terminal on the build deck gives you the most.
I only found this out myself by accident @Daniel Forsyth, after cleaning and rebuilding a few times.