Reply To: Hatsan 44 Regulators Did they

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Rodeo
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Definitely – accuracy first.  Good luck and have fun tuning your Hatsan.  Get a chronograph if you don't already have one – only way to know what your airgun is doing.    One more tid-bit, I also did the firing valve modification (plug five holes and enlarge the sixth).  There is also a mod to keep the hammer spring preload screw from moving.  Drill a hole in the adjustment screw (near the end) the diameter of string trimmer line.  Insert a piece of trimmer line into the hole and cut it off flush with the threads.  When you thread it back into the hammer the piece of trimmer line will keep the screw from moving.  Works similar to a nylon lock nut.