I was reading an article on twitch muscle and essentially when it comes to speed arm > wrist which suggests this could advantageous and wondering if this has been done already before going through the trouble of fabricating one.
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Over sized actuator, short shaft, oversized ergonomic gripped ball top.
Image may be NSFW.
Clik here to view.

Over sized actuator, short shaft, oversized ergonomic gripped ball top.