4 Also at frame 70, one at a time rotate the second, third, and
fourth links of the index finger so the finger points to the left.
Rotating just one link at a time helps keep the finger from curling.
5 Finally, still at Frame 70, rotate the second, third, and fourth
links of the remaining fingers so they are folded toward the palm of the
hand.
Using the Knuckles Toggle for Detailed Hand Animation | 891