Making toolbox part independent doesn't seem to severe it's connections to toolbox, and when modified, it reverts upon reopening and messes up the assembly. That's pretty much the problem I have. I'm using a piece of box tubing from the toolbox, but I need to add features to it. Nothing I do seems to break it's toolbox links, from saving as in a new location, to making it independent, to renaming it and breaking all ext. refs.