I use a mast track stopper:
https://www.sailrite.com/Sail-Track-Stop-Round When I'm in too much of a hurry too fiddle around with the screw on my otherwise fantastic stopper, then I simple loop a piece of line under my gooseneck and tie it off to my spinnaker ring. It's my quick and dirty stopper, I mostly use it when I'm doing unexpected reefing (as in I didn't follow the rule of "reef before you need it").