Shoes mended by hand. Does the shoe line hurt your shoes?

Manual shoe repair and threading do not hurt shoes. Because when he took off his shoes by hand, he opened a groove on the bottom side with a flower knife. Then slowly thread it with a needle. Thread, in the slot. It is not easy to break when you wear it. It looks beautiful, too, so he doesn't hurt his shoes easily. Generally, teachers who take off their shoes are trained for a long time. I'm also good at calling it a day, and it's not easy to hurt my shoes.