Originally Posted by Raid3n
dont go as far as sanding yet. try watering the grommet (the black part) and the neck of the base and see if you cant get a better result, and if you dont try buying a smaller grommet
I use water on my grommet before insertion. You could also use some vegetable oil or olive oil.I wouldn't bother sanding a rubber grommet however.Just get a new one if it's a problem.