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Park Tool BSH-4 Bladed Spoke Holder
The BSH-4 is a good little gadget to have on hand if you're building or truing a wheel with bladed spokes. It keeps the spokes from twisting and therefore losing their aero advantage.
The BSH-4 is notched to fit up four different spoke sizes, including big thick ones from Mavic and Fulcrum for example, and works equally well left or right handed.