I made one and love it ^-^ It was super simple
Took a large dowel rod (I have no idea the size really....it was one I had lying around.....) and sanded one end until it was rounded. Then I sanded the opposite end to a soft point. Nothing that my kiddo would really hurt themselves with if they grabbed it.
Bought a round wooden plaque and found the center. I drilled a hole nearly large enough for the dowel rod and then using a sanding bit (it's all bumpy and freaky looking, lol, I didn't get one of the ones you have to replace the paper on) I softened the edges of the hole so that there weren't any weird splinters or edges sticking up.
Popped the dowel through the hole and using wood glue I tacked the rod in place.
Painted it with acrylics and then coated it with a matte spray and called it finished ^-^
It works great and I love that I can keep spinning and spinning without having to stop and empty my spindle every few min. (I make large chunky yarn, hehe)
Heres a picture of it to try and give you an idea.
It extends a few inches above the yarn and about 6 in below the plaque if that helps. I really like that I can sit and spin and not kill my back!