ever since i started turning pen blanks, i have noticed two things. one being distortion on the inside of the bushings, where they are placed on the pointed centers, and the other being a black powdery stuff. i'm assuming that the powder is from the distorting of the bushings. i'm presuming that the bushings are a soft steel. has any of this happened to anyone else?
i've since picked up an adjustable mandrel, and will be using that.