Guessing you are referring to the large clamp that surrounds the mast and has a screw handle for tightening. Pretty sure those have been out of production for a decade or more. They did look secure and sturdy, but many were broken while bouncing down the highway. I remember people being unable to get parts for broken ones many years ago. Haven't seen one in so long that I had forgotten about them.
People do talk about using bow stops, but most mast supports have a much taller V-shape. Try searching for mast support, stand, and/or crutch. Doesn't seem like it would be difficult to fabricate something...just make sure it's well-padded, rubber-coated, or such.
_________________ Jerome Vaughan Hobie 16
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