It will be very cool to have a stick maintenance tutorial, that will help many gamers, don't hesitate to do it; I confess that this has only happened to me once with one of the PS4 controllers but I solved it immediately, of course, there are cases like yours where the sticks must be replaced.
I loved this control because in fact the sticks reminded me of the Xbox elite control, which are electromagnetic which guarantees durability; Here in Latin America these controls are expensive and in very few places you can get controls like the kingkong 2 pro unless they are ordered or imported.
You made a very big jump from the Xbox to the Switch, but I assume you did it with conviction so that's what's important. I have several retro consoles and the newest are the Xbox One S and the Ps4 Slim, at some point I will make the jump to an Xbox series X or S and a Ps5, but I want to enjoy the game catalog of each console for a while longer because I see that the new ones still don't have many games so far, but my idea is to give these 2 consoles as part of payment for the 2 new ones... possibly I will do it at the end of the year and bring content about it.
I send you a warm hug and thank you very much for your great response... You Absolutely Rockkk!!! 👍😎🔥🎮❤️