Sorry I should have been more specific - not talking about a locking "wedge" rather a locking "dovetail" if you will. I found Ilya's pic in his Member Gallery:
Note the dovetailed locking "piece" that slides left-right. It mates to the notch on the barrel (barrel is silver in the pic). The barrel slides back to the stop and this piece locks it into the correct headspaced position.
The locking piece is supposed to be moved with the tip of a bullet (as it will probably be hot) and my thoughts are to add a long curved handle to one side of it so that you can pull down on the handle and since it is curved, it will force the wedge out sideways.