I just purchased the FastFerment 7.9 Gallon Conical Fermenter and I am experiencing a problem on the first batch. For four days, there was no bubbling in the bubbler, so I pitched more yeast. It's now been a week and still no bubbling. Today I took a hydrometer reading and discovered it was at the final gravity. Apparently I have an air leak in the cap. I broke in the threads according to the instructions, and tightened it as tight as it would go. I don't think the thin gasket in the top of the cap is sufficient to form a seal. Has anyone else had this problem? What solutions are there? I'm thinking about getting some thick sheet rubber and cutting my own gasket.