Used to do all of my cutting around here with the stick welder and portaband. Just got a used torch setup and have a few questions. Everything I read on the internet about the basics says when I start it I should have a 10" flam or the smoke in the acetylene should stop. If I adjust it untill the smoke stops I have about a 14-16" flame. I'm not sure what nozzle is on it. It has one center hole and 4 outer holes. I can't read the writing on it. I do have an assortment of nozzles. Should I have a large cone in the middle after I add oxygen, or should i have 4 (because of the 4 outer holes) small cones that don't change when I hit the lever? I can get it to cut, just fills up the cut behind the torch as I am cutting. (moving fast as I can). Also a few questions about safety, the torch and guages are an Airco, and there are no flashback arresters. Big deal? And whenever I shut the torch off (oxy first) I get a flashback or "pop". Should I be doing something different? Thanks fellas