Griddle Burner Control Valve for Blackstone 22/17 Inch Gas Griddle 1814 1971 2142 2143 1666 1813 1842 1833, Tabletop Griddle Replacement Parts for Blackstone Accessories Grill Gas Valve, 2PCS

I had the same thing happen. Some people said to try rubber bands on the end of a screwdriver or needle nose pliers. I tried drilling it out and I think I made it worse, so I ended up buying these replacement gauges. It was super easy to swap (find the right one for your grill) https://a.co/d/0fpU3Q9a