It is called the Y rod. There was a thread on this and how to make your own. Just go back on previous threads and read how it's made, and how to use it. I think it's Angel09 who made contributions on this thread.
Ghost,
it's not a Y rod made of guava y-trunks, It is like a stick but came from a tree branch, this was the latest information we got from a member of other group and we tried it, it's really different.