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I could make one out of nylon but I didn't think it would actually seal against the seat. I wanted to make it air tight. If you use nylon are you glueing some type of soft gasket material to the surface?

Need some advise on how to change the gasket on my Crosman 160 exhaust valve stem. I am referring to the brass piece with the steel stem that has the gasket embedded by the steel stem, that stops the air flow through the exhaust valve body until the hammer hits. I watched a video on youtube...