The Mutual Power Hercules 680 clone history:
In February 2002 the Mutual Power's supplier (Xpider Co.) copied the mounting system of the Eagnas Smart 707, then copy the turntable and swivel clamp bases of the Eagnas GC to create the Hercules 680 model.
Eagnas Flex 740
2 stainless steel clamps (PN-1012)
Mutual Power Hercules 680
2 aluminum clamps (SC-201)