How can a RED (Reverse Electrodialysis) stack be assembled effectively when FAS-30 and FKS-30 membranes undergo sudden expansion and contraction upon contact with water, causing misalignment of the flow holes?

In my RED experiments, I observe that FAS-30 and FKS-30 ion-exchange membranes exhibit noticeable swelling when they come into contact with water. This leads to dimensional changes that cause misalignment between the membrane holes and those in the gaskets, spacers, and electrodes, disrupting the proper flow of seawater and freshwater through the stack.

What are the best practices or methods to handle membrane expansion so that precise alignment of flow channels is maintained during stack assembly?