There are many ways to do the hand rod attachment for the puppet hand. I have tried rubber bands before and I have seen versions with screws and washers and variants using curved or straight rubber hose that you stick the hand rods into. Since I wanted to be able to rotate the hand back and forth, I decided to do a version using jeans buttons.
I started by bending the ends of the arm rods to a u-shaped loop, just big enough to fit snugly around a jeans button when pushed.
I attached the jeans button inside the puppet hands and left small holes in the fur where I can fit the rods. Because of the shape of the jeans buttons, the hand rotates back and forth but is stiff sideways.