06-02-16, 06:28 PM
It's not atmospheric pressure above the diaphragm, that's the thing, 
Trimming the spring allows the slide to rise a little quicker but it will still settle wherever the air pressure above the diaphragm determines it should be,

Trimming the spring allows the slide to rise a little quicker but it will still settle wherever the air pressure above the diaphragm determines it should be,