First I want to thank you for starting this post - I tried putting one of my quivers on my bow I will be hunting with this year and realized I did not have one made up for it - time to get to work.
As I noted earlier, this quiver has been in the making for a year or two and it has finally come out to where it works really well for me. The following is an arrow in the quiver on the bow and another with me holding the bow with an arrow on the string and a broadhead still in the one arrow quiver.
To remove the arrow, you will notice a little string (waxed nylon thread) that holds the shaft of the arrow. I found without this, the arrow can slide up and down - mostly down and the broadhead falls out! Taking my thumb, I can quickly slip the string off and pull the arrow out - see the next couple of pictures.
To make this single arrow quiver, I am able to get scrap pieces of leather, around 9-10oz, and just cut out the necessary pieces, glue and sew them up and then cut out the necessary holes. When cutting out the hole for your bow to fit through, it is best to start small - you can always make it a little bigger but if it becomes too big you will have to buy a new bow to fit! Here is a couple pictures of the pieces and end products off the bow - the last picture has a three blade head holder for something like the Wensell Woodsman.
Let me know if you have any questions.