Once you get used to the work, you will get well. However, because the tip is a roller, it is necessary to get used to things that have become diamond protrusion type. Especially, it seems that the roller is turning as real feeling, the wound line is not clearly in place, and as a result it may become sideways when it breaks. Diamonds are particularly comfortable cut sounds in the case of straight lines and scarcely fly scarcely. Or easy to feel with sound when flying. Is the drawback of this part unavoidable in terms of structure? If there is something like a trick, please let me know.