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I did buy screwlock PC cable to connect K5 and YN560 flash properly (can use pop up flas as fill same time this way). Its ok and works but k5 PC thread is more smaller than normally so screwlock can not be locked. I have been searching PC cable that have normal size screwlock PC male in other end and small k5 size pc male other end but didnot find...actually not find any k5 small size pc screwlock cable at all. Is there any?