Start by taking a module, pulling the handle out, and inserting an ordinary table knife, sharp edge facing out, between the top of the module and the handle:

Apply torque clockwise, until the left side of the module snaps. Be ready to stop applying torque as soon as the thing snaps:

Lift the cover slightly to make sure the entire left side has snapped:

Now reinsert the knife on the right edge, hold the left (already cracked) edge with your fingers, and apply torque counterclockwise.

That's it! This is what the insides of the module look like: