Mastercool 70057 Black Eccentric Flaring Review

After I put it to the test, this flaring tool was impossible to use.It was a huge waste of time and money.. That's my feedback.

With previous flaring experience this tool is back. Bought it for a project and can't make a clean score without flashes. Tried several times with oil, same result. Stripped ends the same result. I tried copper and aluminium, the same result, with notches, as in the picture. Uses a hard 37* flare tool that looks similar and has a perfect flare with no notches. Only bought this brand as it was $20-30 cheaper. maybe I have a defective one, I won't try another one.