When setting bend tooling the goal is never to produce unnecessary bulges or distortions in the tubing you are bending. In fact, bulging, creasing, and distortions can all be signs that the tooling is set incorrectly or there is some other issue with the bend. However, even a set of tooling that has been properly placed and a bend that has been properly executed can leave some surface abrasions, scratches, or other marring of the tubing. Typically this isn’t an issue for the final product, but there are applications where the bent tubing needs to be clean. When this is the case you typically have two options. First, you can polish the finished piece to remove the tooling marks. The other option is to opt for no mar tube bending tooling.