Just a quick heads-up that the frio double-locking cold shoe, which I consider to be the safest way to mount your speedlight to your swivel adapter, just got an upgrade: the female socket on the bottom (shown here) is now ¼" to 3/8" adaptable. This should make some of you Euro folks happy, as 3/8" is more of a standard there. They are shipping now.
Also, they have those little double-male posts you need if you are gonna swap out your Justin Clamp cold shoes to frios (or any other shoe.)
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