Hi Daria, Chris and all,
It sure is slick the way it just folds on top.
My worry about a foldable winch handle is just that: that it will fold on you when you do not want it to. Winching is often done from a weird position and often one finds oneself leaning heavily in on the handle and leaning over the winch with much weight. If it collapsed at that time, it could cause an injury, perhaps a broken rib.
I am reminded of my concern with some walking sticks: if you stumble and put some weight on them, they can and do collapse, possibly turning a stumble into a fall which is why I have stayed with my wooden walking stick.
Without actually seeing and using one, it is hard to say, but that would be my initial concern for winches mounted horizontally.
Winches mounted vertically, like on the mast, would not generate this concern and that is where I might try one on Alchemy. (That is if it not prone to fall open when mounted on a vertical winch.
Interesting product, thanks for directing attention to it.
My best, Dick Stevenson, s/v Alchemy