All I do is paint a line of tempilaq on the inside of the neck of the case. When it hits the tempilaq temperature it burns off. Count seconds and watch the paint tell it’s gone with drill spinning. Spin the drill at a slow ish pace don’t just let the case set steal. Center flame should be in the middle of shoulder. If you paint 3 or 4 cases and get an average. Time is key. You shouldn’t have to paint the rest of the necks. Even if you had other flame annealers use this process. The thicker the cases the longer the time it takes to anneal.