Last weekend I had a crash with my TBS Discovery and I have no idea why. I assume that the plastic arm was just to weak and snapped in mid air.
I decided it’s time to upgrade and why spent the money if I can design it myself. Using Adobe Illustrator I designed an compatible arm layout and cut it from 4mm thick G10 FR4.
The difference in weight between stock plastic and G10 are just 1.2 grams per arm.
Update 2017: I released the original files of the arm on my GitHub.View on GitHub