Yeah I was surprised by how much the basic packer actually felt like cyberskin. I had modified cyberskin packers in the past, adding flex rods by poking a hole through the shaft with a piece of wire, then (stretching that same hole) pushing a flex rod in this hole and pulling the wire back out of the shaft afterwards. I did that without heating the wire though. The same method worked, for me, in the very same way with the RM basic packer. But I would probably have shied away from the experiment if it hadn't already been torn at the base.
What I don't like about the basic packer, apart from the fact that it shouldn't tear so easily, is the shape of the balls. They seem oddly balanced and move in a way that doesn't feel "natural" to me when I'm walking around. Of course that's just personal preference.