hey guys I have this gas burner from HF. I also have a foundry I made. my goal is to heat my crucible to the point of melting aluminum. however when I insert the burner end into my foundry (flush with inner wall) the flame seems to dramatically weaken and sometimes goes out. I'm thinking the reason is the wall of my foundry is so thick it messes with the air flow maybe? what do you guys think? maybe extend the black tip to about 12" or so? has anyone had success with a similar setup? all advice is appreciated.