Do not remove heat shield. 6" probe will work. Drill will be whatever your probe size is, and you will want to just use the drill bit by hand. The refractory is very soft, so you don't need a stopper. You don't need to seal it with anything. View attachment 234193
I’ll have my Auber and probe in this week. Taking on this task. How far in do I drill with the 6 inch probe you guys recommended. Do I just drill through the initial cast and stop drilling?