3. Solid Edges to Shell Surface

We also need to bind the edges of the flexure mount to the shell surface to make sure the model doesn't twist and turn between the planes (in other words, we're restraining the rotational movement).

This step is very similar to step 2, except that you should select the Edges of the Flexure mount as the contact bodies (4 edges), and the same shell surfaces as the target bodies (4 bodies).

Repeat for the remaining mounts.