The kanger subox nano which i have has no option for zero airflow. I need to fill the smallest hole so that i can seal it between uses to prevent oxidation of nicitinoids which causes me the hiccups. What is the best way to fill this hole. Welding would be no good because i wouldn't be able to chase it flush. Epoxy might get on the turnable ring and stop it from turning. Hot glue might stick out proud too and prevent turning. Would wood filler work?