Step 1: Start
T profile plate 2 mm thick. with holes for screws. Zinc protected against rust. A 25 mm steel screws, zinc protected, for metal. Self drive in.
Step 2: Tool
Step 3: Looking how should be fastened
Step 4: Reinforcements
Step 5: Testing
I menage to stand still and secure, to move, to climb, to take a photos ... from the point which is without this..... impossible.
Step 6: This is that
Well, now I have help, for eventual situation. Not heavily to carry in backpack, cheap and strong.
Its work for me,
Yours on your responsibility.