It should pop out ... the valve spring should be under tension. I don't normally have to use the threaded end except to put it in sometimes.
__________________ Spyder Aggressor
-- Palmer stab - milled for timmy bolt Automag
-- ULE body - Q-loader - Logic 90° frame Pump Autococker
-- Palmer Fatty stab - WWA pump kit PGP
-- Kframe - Quick Changer - CooperT Bolt KP2
-- Performance tune and side tube re-addition by Dan Sergison PMI-1