Here is a break down of me building one:
This is part of a foot board. I plant to cut off the top almost 1/2 of it.
With a big gaping hole!
Here it is after I have glued the base and a finial on top.
Now for filling in the huge space, I used caulk. I didn't have painters caulk, which is what I would recommend so after it was dry I went over it with some wood filler.
This is it completed by a little distressing and glazing with some black paint mixed with an antiquing medium.