David Ford wrote a review of Brooks-Range Ski Binding Tool (Ratcheting Screwdriver) on March 1, 2013
Works great, but the little plastic ring on the racheting piece broke almost immediately and I've had trouble with the little piece of spring metal that holds the ball bearing in place... it fell off and I had dig in the snow to find the ball bearing again. Another negative is that because of the shape of the handle, it can be difficult to use it on screws that are close to the ski and run parallel to the ski surface... like the heel unit position adjustment on a Dynafit binding, or probably some DIN/RV adjustments. So double-check that you can use it on all of the screws you might need to adjust. All of this said, it costs $10 and you should probably get one.