Their is a big rubber bushing kind of deal that comes with the cool sky. I left all my fibers a little bit long and then bundled them together and taped them to start with. Slide them through the rubber bushing, if you don't have enough fibers to get a snug fit when going though the bushing you can just stuff in some extra short pieces of cut off fibers to fill it in tight. (make shure you slide the nut over the fiber before the bushing!) When you tighten the nut to the Cool Sky it squezzes down on the rubber bushing to tighen it all up.
Now tape everything together out side the bushing so that nothing can slide. Take a hot knife and cut the whole bindle of figer off about 1/2" past the bushing I think I did. Now if you want to get the most light through it take and rough sand the cut of boundle with some 220 sand paper and then wet sand it with something like 1200 grit. Just set the sand paper on a board and rub the fiber bundle on it.
One thing I do have to change. When I did all of my .05 fiber I kind of did it in sections and made individual bundles that I made one big boundle out of. So I have I think 6 little bundles into 1. Well this works fine except you get a little bit of pattern when they twinkle. You can see the section because they are all bundled. I have to brake all of them up and mix the fibers around so they are more of a random mix.