I purchased some new heads/coils for my davide a few weeks ago and noticed a difference. The grommet is softer. How I found out is when I use one on a mech. When I put the tank on I had no draw . I take it out and notice the grommet is squished. The mechs I used were the smok e-pipe and a maraxus clone. I know the maraxus has a floating pin and the e-pipe doesn't. My opinion on the grommet is its to soft . Has anyone else had noticed or had a problem.