I have a Diversion 180 that I bought new a few months ago and have finally fired it up and tried to tig some aluminum. The aluminum I am working with is 16/18 gauge so it is thing. I am repairing automotive body panels so there is some pitting in the aluminum. These have been stripped and blasted so they are clean. What I am having issues with is the arc. The arc is "dancing" all over the place. I followed Miller's recommendation for preparing the tungsten. Made a point then landed the tip. I think I did that part right. Any suggestions on why this is happening. I searched the forums and really didn't come up with an answer. Oh, it worked great for doing steal. Thanks.