Try setting the seal plug more firmly. Push on the trigger plate HARD to push the seal plug up into the gas cylinder. Sometimes the orings are a little hard to set. You shouldn't have to disassemble your grenades down to the little trigger ball level often. Alternatively, unscrew the rear half about 2 turns ONLY. This pulls the ball seat back far enough so they can seat even if the plug is not pushed fully into the gas cylinder. Screw the grenade back together and the balls will push the plug forward and seal the oring.
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