I ought an answer here, because the question is pretty reasonable.
Me and George, believe that the best characteristic of a mod is the right handling, the kinaesthetic feeling you receive, just by holding it and playing with its button, ring, caps etc. Many times per day, we open the cap and we screw-unscrew the tube. In order to use extension sleeves in the 22 mm GP PAPS v2.5, a M21 threading is needed which means, threads will be thin and the feeling of the mod will change, it won't be robust, but delicate and that is not what we like.
The 23 mm territory is the road for us, to apply extension sleeves, airflow controls etc keeping a minimalistic look and without sacrificing the handling. The 22 mm mods have to be simple. Of course, this is something that reflects our own way of perceiving the design of a mod, and it isn't necessary the optimal approach for someone else.
What a great answer buddy. The PAPS has been very successful and the reason many of us are loyal to you and own many is because of the look, feel and construction. It is artful a beautiful mod yet so simple. It feels solid in the hand and is the perfect size for all. All of the parts work together in a way instruments do to make beautiful music.
You know some of the expensive mods I have owned and sold because they didnt feel right in the hand and I couldnt get over the look of a pieced together device. (one of them is the hottest Greek mods on the market and I had mine less than a day or two - didnt feel or look right). I can care less if voltage drop is amazing as if the rest is not appealing I dont want it. Voltage drop at some point does not matter anyway once it measures at a certain point. Even the best vapers can not tell the difference after certain level.
You and George keep doing what you do best, we know when you two are building/working it is to bring out the best of all worlds and not just one key part like many builders. This is why GP is so successful.
I still talk about how you and Imeo respect each other so much, I have talked to you both and there is great respect between you.
You also know that is one of the reasons I am loyal aside from the fact that you are a caring and good man. That means a lot these days.
You give ideas or suggest items to most builders and they ignore, don't listen or get mad. I've been down that road and so has another buddy of yours here (pita Kiba!).
Any way brother keep doin it and go tell George thank you also.