You can swap a 80 PSI spring and cup onto a 60 psi pump and make it a 80 psi pump. I have shimmed the 60 psi spring around .070 and it nets you around 8 more psi. At some point you will hit coil bind shimming the spring.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow.
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