Inspired by "Gopro - Swivel mount" which designed by 3D_CC_design. I have re-designed it for my needs, such as breakaway design because my sport skills are not that good yet. With breakaway design, it might be safer. http://www.youtube.com/watch?v=9LizdBh_b-Q&feature=youtu.be http://www.youtube.com/watch?v=-0p2nJsMJNI&feature=youtu.be 2014/03/30 Updated stl files and instructions. 2014/05/11/ New video: http://youtu.be/FsndKbkFV7w 2014/05/17 New video to show brake away design worked: http://youtu.be/iaoP9MC4U7c I printed these parts on MarkerBot Replicator 2X Filament: ABS Infill: 40% Number of Shells: 6 Layer Height: 0.2 Supports: off Raft: off Extra Parts: 2 x Strong magnets: Diameter 8mm, Thickness 10mm 5 x 623 bearing 1 x 608 bearing 2 x D-Ring screw for camera 2 x M3 washer 7 x M3 nut 1 x M3 lock nut 2 x M3x18 bolt 2 x M3x16 bolt 1 x M3x30 bolt 4 x M2 nut 4 x M2x16 bolt Use 2.0mm bits to drill four holes on your helmet.