I picked this mast step up at the Gull Lake Ice Yacht Club swap meet in Grand Rapids Michigan last weekend. It looks pretty sweet. The actual mast step ball you can take out with your hands, without taking your gloves off and move the ball to whatever position you want. I saw the Sarn's prototype adjustable mast step that slides on a track, but this one looked more sturdy, it has 6 mounting screws as opposed to Sarn's 4 mountinging screws and the fact you don't have to take your gloves off to adjust the mast step and no tools involved. More sail time!
The contact info for the gentleman who makes the mast step is:
Name: Clinton Renji
Company: 3R Machining and Mold
Phone: 262-649-6946