I decided to check back here after a few days, I have to say I’m disappointed.
Oh well on to my work.
I took my entire pump apart and built it back up while checking for faults. So far all I have found were two but two very important ones.
1) As mentioned before the spring is too strong. The reason for which is because it needs to be able to with stand pressures higher than the highest rating on the gauge. In this case the spring can probably with 31-35 psi before crushing into itself.
Heating the spring over a period of time or over working the material coul produce the metal fatigue needed. However, replacing the spring would be the wisest and easiest choice. Home-depot sells a mixed case for about $10. One of which I know will fit the pump with a third of the pressure.
2) I used my brand new pump for the first time yesterday then checked under the handle. Sure enough I saw evidence of chafing from the plastic on plastic rocker fulcrum. So a small piece of fabric or rubber referee to as “chaffing gear” would be needed to optimize the hand pumps longevity. At least for what we are using it for which wears the pump out faster than auto repair.
I am thinking about hot gluing two pieces of felt, or something thin enough to not off seat the handle.
The hand pump’s guide reccomends using either a synthetic oil that is silicone based or a salad oil (anything but petroleum based) to lube the rubber seals and piston, however almost any lube will do such as KY (glycerine and water based) or platnum WET (silicone based).
I also suggest replacing the hose at least once a year or whenever cracking appears.