Re: I got a big problem =\
You can buy one at a local shop most likely or from an online dealer. However, if the former isn't convenient and you don't want to wait for the latter to arrive, you can always put a layer of teflon tape around the surface of the stem where the grommet normally sits. Then, wrap several layers of duct tape around that to create a temporary seal. It should work for a number of smoking applications however, it will loosen after a while. But, it should do you until you get a new one if you've ordered one online. The teflon tape will prevent the residue from the duct tape adhesive from getting all over the stem. Smoke happy.