Delrin valve stemApril 13 2017 at 10:02 PM
B3ntong (Login Oragon2)
Response to Delrin QB 78 valve stem question
Got mine from MA and was told to check the seat of the valve make sure no nicks and uniform all around. Apply mild grinding compound then chuck the stem to a drill then slowly turn it while pulling on it (valve out the air tube of course) turn it until you get a uniform in print of the valve seat. I had to turn mine 2x to get it to seal forever.