Air valve spring

Diegojavbau

Air-Valve Autobot!
Today I extend the air valve spring of my IWATA CR REVOLUTION because it start to not return very often and is very annoying , at first I thought that need some cleaning but was not dirty , maybe the o-ring is starting to degrade ?
I buy this airbrush just 6 months ago and never use uretanes or solvents ... , is a common issue ?
 
I've never heard of a air spring going soft especially so soon. Is the inside of the valve also clean, not just plunger?
 
The lunger looks brand new , as the rest of pieces , I feel like the o-ring turn too tight around the air valve piston , work well now but is getting numb again
 
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