I need to hang a large wooden dowel in my closet to hold onto all my hangers.

This thing is a Pole Socket. It comes in a matched set. One side is a closed socket, and the other side is half closed. This allows you to mount them on opposite walls, slide the pole into the closed one,and drop it into the half open holder on the other side.

There's a counter sunk hole in the center of each so a nice flat head screw can nestle in there and not get in the way.

I do want to add some little support, or rounding, or something to the outside of the socket so it is more stable in practice.

1. Print a set, for as many poles as you need to mount
2. Fit a flat head screw (roughly 4mm) in the middle and fasten it to your wall
3. Fit the pole into one side, and then drop it on top of the opening in the other.
4. Rejoice!