I have a GoPro mount build in the stem cap. I asked Paul's Comp to make one but found one on eBay before Paul came out with his. The one on eBay has now been copied in China for a fraction of the price. I'm sorry to say the copy fits better than the original. What I really wanted is a stem cap with a leveling and panning base and a standard camera screw sticking out so I could put a small ballhead.