Sorry this took so long, but I finally rebuilt a pod using the Performance Analysis Company ACD-2020 dual-diaphragm repair kit, and photographed it next to an OE, unmodified pod. The travel is almost exactly half as much as the original.
Full photos are at
this link. The two main photos are below.
Again, the ACD-2010 repair diaphragm works perfectly, it's only the ACD-2020 kit which restricts travel. Out of the dozen or so dual-diaphragm pods that I've replaced, almost all of them still have a good "large lift" diaphragm, so you probably don't need the ACD-2020 kit in the first place. It's the "small lift" diaphragm that usually fails, and the ACD-2010 kit is an economical way to repair the pod.
