I needed a GoPro adaptor for my...GoPro, so I designed one as the ones I found online were either too big or not what I was looking for. The design allows for an M5 nut to be used, however I found that the bolt screws in very snugly and does not require a nut to be fastened. Should you need to, however, you need to use a long m5 bolt as the standard GoPro bolt is too short for this.