Four Band Rings
This solution will be solve the four band rings shown here.
Step1: Get bands A and D together as shown in Fig.1.
Step 2. Pick the ring up and let bands A and D hang from rings B and C. Bring bands B and C together with a half twist. This will capture bands A and D in the figure 8 that is created as shown in Fig.2.
Step 3: Fold band A and D up to complete the ring.