Ok here is the break in the arm.
[ATTACH=full]5033[/ATTACH]
[ATTACH=full]5035[/ATTACH]
[ATTACH=full]5036[/ATTACH]
It looks pretty clean so i'm thinking a bit of glue then apply that instamorph for a bit of added strength. The last photo shows a tab which i assume is to give the arms a bit more stability when folded out, lucky that this is still intact!
Quite a cool video i found showing how that instamorph can be used with drones.
[MEDIA=youtube]1ckTc6zPm-M[/MEDIA]