The pressure a mechanical pump produces is controlled by the spring inside it. A lot of manufacturers use the same spring on everything they build, and it's WAY too strong. All the camshaft and lever does is raise the diaphraghm- - - - -the spring produces the pressure.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!