You can even get started with plaster of paris, water, a few baits, a pyrex container, and old baits to melt down. Normal handpour molds will come out with a flat side, but I have made a perfect senko mold. What you do is put a small, straightened hook into the nose of the senko, tie line to it, then hang it from something with an adjustable knot. You then pour your mixed plaster into a tall, skinny cup, then put the senko all the way down into it with a tiny bit sticking out. Then, when the mold is dry, pull the senko out, and you have a perfect mold. You don't need an injection mold for worms that are thick enough that pushing them into the plaster won't bend them.