This will be my last post on this subject. I was looking for Extreme service kits on ebay. Every once in a while a few pop up for sale. I came across an Extreme for sale and this is what the seller put in the discription reference getting it serviced. "HOWEVER - The tech informed me that he could not successfully adjust the pressure setting for the second stage to meet factory specs. These second stages are apparently notoriously difficult to adjust and deteriorate with age." I don't know if this is true or not, but it helped me make my decision. Thanks to all for their input and suggestions.