I've been loving the vivi nova. Have been using them on the Ego Twist. I got tired of the lopsided look and the battery life so I jumped to the Provari. The only problem is that the provari seems to lack the airflow cutouts found on the ego twist. I assume I need some kind of 510 to 510 adapter to give it a little room but I'd hate to have an unsightly gap between the tank and the battery. Does anyone have some suggestions?