@@HungTran-dv5me sir i am a above knee amputee from india i have a pin lock liner socket but im bored with this so i am thing for making a new socket can you please make a detail video on DIRECT SKIN SUCTION SOCKET OR NON LINER SOCKET with its advantage because now a days liner is so costly that we have to change it after 15 months of purchasing ..please make a detail video plz sir plz 🙏🙏🙏