Hi Imeo, thats what i did, hold my palm over the bottom of the mouth piece, without the drip tip its 100% sealed, with the drip tip i can breath true it. With the big o-ring it still is leaking, not as much as with the small o-ring ofc. With the big o-ring its very hard to adjust the drip tip, and when the o-ring dry out, it wont move. Dint try to apply brute force to move it, as i was afraid to damage the rebuilde part. So have to take of the entire mouth piece to adjust the drip tip. Without the drip tip its
vaping like the Ithaka, more dense flavor and abit more flavor full taste. So my guess is that either im very stupid or there is a something wrong with the mouth piece or the drip tip. I can try different o-rings on it when i get the time. I really love the new penny, and im sure i will get the full benefit of it in time