PS I modified this procedure; it still works as does the procedure tj talks about which has been around for a while, but I like to focus on what you can do without having to go buy stuff. So, look around your house. Chances are, you'll find an ink pen with a rubber grip somewhere. These can vary in size and quality, of course, but almost any of them will do. Peel off the rubber grip and cut it into slices (creating your own gaskets/seals). This is better than a rubberband because whenever you change attys you have a mess to clean up and one or two gaskets beats a stretched out piece of rubber any day. They are much easier to deal with.