 " GoPro Jaws Flex Clamp Mount
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                    GoPro Jaws Flex Clamp Mount
The GoPro flex mount can enable you to clamp your GoPro to any object from 0.6-5cm, in diameter. You can attach the GoPro directly to the clamp to enable low-profile mounting, or use the the neck to gain a wider range of camera-angle adjustability. The jaws grip any object weather it is a irregular shape or super slim due to its design.

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 "GoPro Surfboard Mounts (GoPro Official Mount)" "Camera & Photo Accessories - Page 311 | All Tech Toys"
"Mount your GoPro to surfboards, kayaks, SUPs, boat decks or other gear where maximum holding strength is needed. Includes an FCS compatible male plug to mount your GoPro using an FCS center fin socket." 