What does a flashback arrestor look like? I'm not sure if the oxy/acetylene welding set up I got has one or not. Also, is there anything I should be aware of before I start setting everything up? I don't have a welding bench, just wood benches. If I weld on a brick will that be okay? I have a woodstove to heat my shop where I will be using this, is this any concerns while I am not using the welder? I will keep it on the opposite side of the stove. When cutting metal with the cutting torch, do I just heat the metal till its red, then hit the long lever to blow the metal away? Or what? I have welded with oxy/acetylene before, just not cut. The current tip I have right now is size 1 that is for 1/16" metal. What is the approx. cost for each welding tip and what other sizes of tips should I get if they are: Size Metalthickness 00 1/64" 0 1/32" 1 1/16" 2 3/32" 3 1/8" 4 3/16" 5 1/4" 6 5/16" 7 3/8" 8 1/2" 9 5/8" 10 3/4" Also, is a tip cleaner a brush? Or what is it? Should I get one for each tip I buy?