When I did my molds, I hung the clay plug in a tube and poured the silicone in around it. The molds turned out good, but it did take allot of silicone the way I did it. I would have liked to do a silicone jacket mold with a fiberglass mother mold around it. It would have saved silicone and allowed me to pull the dread without cutting the silicone (I think). As it is, I had to cut the mold because even with mold release (which I no longer use) it created enough of a vacuum that it would tear before pulling free. Maybe a very small hole in the end would help with that. I cut one seam, and when placed carefully into the tube, the seam is so light you can hardly see it. My curiosity has got the best of me now, and will order the BJB in the next day or two. I used Mold Star 30 platinum cure silicone for the first mold I made, which to me was a little unnecessary. The rest of my molds are Mold Max 30 tin cure. My advice to you is save yourself some $$$ and go with the tin cure... the platinum stuff is twice the price ($200.00 for a gallon), and there's no real advantage. Hope some of this was helpful. Keep us updated!
Brian