You briefly mentioned that sometimes the neck can be too loose. A nice fix my repairman taught me for that is to paint some clear nail polish on one side of the neck tenon. It works great for me. Eventually the nail polish dries out and flakes off, so you have to reapply it periodically, but it's inexpensive, and it works! (The auto-translate feature in the videos has gotten *much* better. I have some screen grabs from two to three years ago of some of your videos, where the translations are hilariously nonsensical.)