I have something new for self-bondage, a long strap like the ones used for those fanny packs, and some clasps or buckles.
I used the buckles that will hold the strap and not let it slide up or down.

I used it to bind both of my wrists together.

This is how I threaded the strap:

+---+------+----+
|   |      |    |
|   |      |    |
| D | U  D |  U |
|   |      |    |
|   |      |    |
+---+------+----+
                    Strap comes from -->

From the side view, the strap after threaded through the buckle would look like this...

 Tab from buckle
   |
   |
   V    / \    / \
  ===+---+------+----+
     /     |  |    \
           |  |      \
           |  |        --------------------------
           |  |
           |  |   <-  Loop to slip wrists or ankles through
           |  |
           +--+
Happy Self-Bondaging!
(index)