I do like John and Scale. I cut off the extended part of the mounts and I tap in the threads. I have a lot of used mounts and when I have one with over sized holes I use the fiber lock nuts. No set rules. I tend to buy more of the Great Planes adjustable mounts when I need a new one. They are usually in stock at my LHS but I really have no favorite brand. I also have a small stock of aluminum mounts that I like.