There are some things other people do that I can't seem to get the knack of no matter how hard I try. However, double flaring steel tubing with a cheap $25 double flaring tool from Sears just hasn't been a problem for me. My thoughts are, try the cheap tool first to see if it works for you and then if it doesn't, go ahead and spend the money to buy the expensive one. You may save yourself a lot of money, or you may spend an extra $20. Just be aware that sometimes, for some people, the cheap flaring tools seem to work.

Dave