Just a habit of mine: When making the wedge, open out the hole top and bottom so it can tilt in the direction it needs to and does not trap one scale and make it impossible to get all lined up properly. Think of an "X" or )( for the shape of the hole looking from the end of the wedge. Also, leave your wedge a bit oversize till you have fitted every thing and then finish it carefully after pinning.
Have fun!
~Richard