This is a suggestion rather than a question. One issue I have with the Aeropress is that the plunger does not stay perfectly concentric with the cylinder. When it tips it has a tendency to lose the air seal and even allow liquid to leak past the seal. This could be solved by adding 4 veins, or ribs that have a close fit to the cylinder, running lengthwise along the outside of the plunger and keep it in perfect alignment. I know making a new die is an expensive proposition, but at whatever time you make a new model you might consider adding this feature. Have you already considered this option and rejected it for reasons I can't forsee? – From David C.