I've tried the o-rings fix myself and found that the hardest part was threading the ring through the hole. I finish one leg and get the eye hook and o-ring attached correctly. Then I use a length of wire to guide the ring through and then catch it using a small screw driver like this one:
After that, I connect the other eye ring to the ring, and then screw the other leg onto the ring, not screw the ring into the leg. That works really well for me, and so far I have fixed three figures this way.