I have a universal hardshell case that I use for my Jazz or Precision, however when it's closed, the guitar neck drops a few inches inside the case, since it's not a perfect fit. I have seen cases where there is a small leather or cloth type strap that snaps into a button that goes around the neck to keep it from moving. When I do a search for this particular strap/button combo, nothing comes up anywhere. Anybody know what this is actually called and where I can buy one? Thanks in advance.