i drilled the holes bigger but its a snug fit around atty, i know the rubbers are tight but there isnt much room around the shield and atty. if you have a flush 510 connection you will also need a 510-510 sealed connoctor. i found this also tigned up the draw. my omega has a 4 slot 510 connector and the sealed 510connoctors are only 2 slot makeing a tighter draw. it almost feels like if you roll a analog cig really tight and you have to suck really hard. may tinker with it tommorrow and seeif i can looseing it up