Ive changed the original design a bit. Adding slits for velcro straps for easy attachment and changing the number and position of the rivets, but feel free to adjust the blank template to your own needs.
Perhaps you need to adjust the size a bit depending on your arm length.
You should be able to see the positions for the 5 rivets per arm, since there are little indents for them. There are 2 on each of the slits on the wider part and one close to the part that will sit close to your wrist.
The author marked this model as their own original creation.