Lee 92104 Primer Seat Adjuster. Small and large gauges to ensure your brass meets the demanding SAAMI primer pocket size specifications. Insert the â€Åâ€Å“GOâ€Â plug gauge into the primer pocket, if it does not fit the crimp should be removed. Consider using a Lee Ram Swage or Lee APP Swage to complete this task. If the â€Åâ€Å“GOâ€Â gauge fits very loose, invert and check with the â€Åâ€Å“NO-GOâ€Â end. If the â€Åâ€Å“NO-GOâ€Â fits to the bottom of the primer pocket, the primer pocket is oversized and will not reliably hold all primers.