Fixed the Avery Squeeze
Found the problem. Started the disassembly when I noticed that the flapper that activates the plunger for the air had moved 2 or 3mm and was rubbing on a brass block and the friction I was feeling was the flapper coming over center. I loosened the allan screw to adjust the flapper, adjusted it, tightened it up and it was perfect. Nice and smooth..................
I bought this used and when I look at the wear, it appears that it has been like this for a long time.