In reply to ColdWill:
No, he is doing it right, or let´s say according to instructions if using the Double Spring 2.0 leash (the regular Double Spring model is a bog standard leash with a sling in the centre for lark´s footing to the harness and two carabiners on the arms for the axes.
The 2.0 Model starts with the sling, has a carabiner in the centre and another at the other end. The instructions state:
An elastic double sling system to avoid losing tools when climbing on rock or ice, solving the problem of modern climbing without a leash.
The Double Spring is attached to the harness by looping it through the tape ring over the harness itself.
The two ice axes are attached with 2 small carabiners to the holes on the spike (max 750kg).
Permits easy changeovers of hands and tools.
The two sections are so elastic that they don’t impede any movement and allow maximum arm extension when required.
Compact when required, long when required.
edit: If you don´t believe me, click on the link, select ice axes, and scroll down...
http://www.grivel.com/products/ice/accessories/
Post edited at 18:32