I was doing a cook on my newly purchased gen 2 performer the other (windy) day and had the grill fired up, ran into the house to grab the meat, came outside to find my new (to me) grill racing across my driveway. I caught it in time to avert disaster-wish I had a vid of me chasing it to post. Anywhow, I found what look like locks on the casters, tried to use them, with no luck, so I wouldn't have to chase it again.
Is there a trick to locking them?