I've been thinking about this for quite awhile and think I have the cure for the occasional bass with a looser than desirable neck pocket. The solution comes from the unlikely realm of gun repair. My father was an accomplished gunsmith. He specialized in long guns and was in high demand in the area in which he lived. One of the problems with both shotguns and rifles is that the neck isn't supported along the entire length of the stock. This caused inaccurate patterning because the neck would literally "wobble" under the pressure of firing the round and as it heated up the problem got worse. The cure was to have the barrel "bedded" in the stock. This entailed filling the barrel channel in the stock with a fiberglass resin (no fiberglass) then setting the barrel in the goo until it had dried. What it left was a firm foundation for the barrel to lie in and kept it supported along the entire length of the stock. The resin didn't glue in the barrel so it was always removable. I believe this technique could be used in basses. It would require using a release coating applied to the neck so that the resin wouldn't stick but you could set the neck with the resin filling the voids and have an absolutely solid, form fitting pocket. I know that there have been some basses that I had to pass up purchasing because of the loose neck characteristic (especially some of the Fender "Tilt-a-Whirl" varieties) and perhaps I shouldn't worry about it if the idea is a winner. Whadyall think?