We used cardboard spinners. A thumbtack was pushed through and bent over to form the pivot. We got the cardboard from the back of notepads of paper. Concentr

We used cardboard spinners. A thumbtack was pushed through and bent over to form the pivot. We got the cardboard from the back of notepads of paper. Concentric circles had equal divisions to form the d4, d6, d8, d12, and d20 ranges.