I saw one on the Auckland Boat Show last year that was essentially a piece of plastic tube about 100mm diameter 200mm long, a one-inch split down the length with a sort of astro turf on the inside. Can't remember how it attached to a handle/boathook.
There is this year's boat show starting this week in Auckland. I'll have a look around when I'm there and will post a result if I find one.
SORRY THINGS SEEMED TO TAKE FOREVER SO I CLICKED AGAIN.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke