With the Non-sew-snaps from Prym to get less cope. Especially when the material is thicker, I do not want to renounce Yline. At Prym the small prongs must find their place and it works too seldom. In Yline a hole gouged (eg Knipex 9070220) and then with 300 g hammer and tool supplied the central cylinder of the push-button portion is formed. This then stops.