Two set screws on front 2mm. Mine is a hard stop at 0, but when you are resetting make sure you push down hard when tighten the set screw or else there is a little over run in my case 2 clicks.
Thanks. Hate to hear that. I hate the way Vortex uses the set screws to place the turret to zero and I hate their zero stop.
I know it's not the end of the world using those screws, just seems like a lift turn push down feature would be better