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I've done fine with barrel styles, from both Sampo and Spro. Spro power swivels are some of the best, and they are barrel style. Barrel swivels tend to be smaller and less bulky.
Just curious, does anyone know of anywhere semi-local I can buy these and avoid shipping costs?
I too sometimes use the very small and strong Spro Swivels, but I have not found them very helpful for line twist, but great for joining a light braid to a light floro...