It is important to keep the ferrules clean during fusing because dust between them can keep them ever so slightly apart, which is enough for liquid fiber material to leak between them and form a wing. Maybe if there were no dust on the ferrules they would meet perfectly and prevent wings. | It is important to keep the ferrules clean during fusing because dust between them can keep them ever so slightly apart, which is enough for liquid fiber material to leak between them and form a wing. Maybe if there were no dust on the ferrules they would meet perfectly and prevent wings. |