Go Pro adjustable mount.

The lower half V11 has the lower half and the locking nut. Upper Half v5 has the top half. On upper half I used a 5mm nut that I heated up and pulled into place using a 5mm bolt 25 mm long. Screw on the locking nut on to the lower half, then put on the upper half. Rotate the upper half to the direction you want and then rotate the locking nut up to secure it.