HighGreat Mark simple lens holder

This is a simple extension to hold the HighGreat Mark camera lens at horizontal (0 deg) rather than the 15 deg original. The drone needs to be modified as follows:-

1. Remove the 4 plastic patches under the motor arm swivel points (use a sharp knife to lever them up)
2. Unscrew the 4 central screws using a flathead screwdriver.
3. Remove the 2 screws hidden at the centre of the battry box using a torx screwdriver.
4. Lift off the top.
5. Undo the 2 cross head screws at the back of t