Are you talking about an Retro/E-=Mag/X or a classic valve with both halfs stainless steel? One uses a thick flat on two sides seat and the other an o-ring (thick seat = classic).
Either way, the piston should be able to slide fairly freely. It's the wide part at the top that does the sealing so rod itself doesn't have to be a tight fit.
Either way, the piston should be able to slide fairly freely. It's the wide part at the top that does the sealing so rod itself doesn't have to be a tight fit.
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