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You may have seen a pulsable spin button toy [link] I think the same thing with a two finger loop as well as a pawl (or other simple gearing) would vibrate. Make it out of silicone to be soft and vibrator like and it becomes a finger powered pulsing vibrator. Just made of plastic it could be about
4 cents per sexual pleasure vibrator.
wet glide strips, made from polyurethane oxide and polyvinyl pyrrolidine could be used as a wet slippery glide surface coating on the two finger all polymer buzz vibrator.
spinning button toy
[beanangel, Dec 15 2016]
||It takes a certain imagination to see a spinning button toy and think of marketing it as a cheap way to rub one out.
||Even with mechanical advantage, your going to have two fit,oversized muscly fingers. It won't do the other sets of nerve groupings.