There are always certain bends that require a little more hands-on effort. To help protect the tube, Sire slides a coil of steel wire scavenged from some stock GM master cylinder brake lines. When doing this type of bending, the main consideration is to not exert all the bending force on one section of line, otherwise it will crimp. Typically your thumb makes a great mandrel. Thankfully, the Eastwood line takes shape easily.