before purchasing my first reo last week I remember hearing about the o-ring under the rm2 atty, it had stated that this o-ring was really only for getting the correct orientation for the air hole. so when I was ready to vape, my specific orientation really didn't require this o-ring so I didn't use it. I tend to vape the reo from the edge with the door facing 90 degrees away from me, so I located the air hole opposite of this. this placement made the rm2 fairly snug, so I just felt like the o-ring was unnecessary. well today I tried to vape the reo in a different way, vaping it from the side with the door facing me, this required the rm2 to be in a different position which did require the o-ring. for some reason I feel like the o-ring makes for a better vape, it seems like it hits a little harder. anyways im keeping it in. have any felt the same? like because there is a better seal the rm2 performs better? or is it in my head? or maybe I never had it as tight as it should have been initially? I mean it was definatley snug before but not really tight, anyways now its tight and its seems to be working better. thanks