Microsoft Windows Kernel Power Error 41 Server 2016 Solucion

This is my problem but its not making contact because the part that rotates when you press the l3 or r3 button has a third of it broken off and when i opened the controller there was no broken piece in their , because its broken i have to push down harder to get enough contact for it to work. ( i want to know what the pieve that rotates is called so i can buy a new or if you can evan buy them.