Well, I was told that nobody had documented this procedure so I will try to do so now.
The sad beginning:

My project and assistant:


After opening the gun just remove the pin that holds the valve release
lever in place, unscrew the feed line and lift out the valve and chamber while twisting it to remove the release lever from the trigger wire. And lift out the whole unit.



Unscrew the clamp holding the tubing to the valve and pry it off. There may be some adhesive holding it on. The end cap on the chamber was glued on so I had to cut it off with a dremel tool. Then just slide out the bladder assembly.


At this point I got busy and forgot to take pictures (Sorry) but all you have to do is tap the clamp assembly out of the plastic plug that has the line on it for the fill gauge. I put it on a roll of electrical tape and tapped it out using a screwdriver and hammer. This clamp comes apart just like the other end except that there is a plug in the end of the bladder tube. You need to order two types of tubing from McMaster Carr. Part numbers 5234K86 and 5234K92. They have minimum lengths you have to order but the whole thing came to $33.59 including shipping.



And here are the results:


