Not a Rocna, However, one could cut off one of the fingers, bend a couple of the other fingers,chrome plate it, add a section of chain to weight down the scope of the heaving line and you may have a close copy of an "Eric" approved Rocna.
Be careful though because of you don't read the instructions, you can easily hit the boat on the other side of the dock. Like don't read
"Clear the range before firing" in the first post.
Al