I have an old Goodell Pratt no 5 drill. It works fine but I cannot dissamble the chuck to clean up the internals and replace the springs if needed. The chuck is Patd date 1895 and has three visible springs between the three jaws. I cannot unscrew the inner part from the outer shell part (terminology?). Is there a safe way to unstick these two pieces? Perhaps soak them in some kind of rust remover? The chuck is not rusted, on the outside, and the jaws in the chuck tighten and loosen over a drill bit quite smoothly. I have soaked the chuck in WD40 for several days, but no luck. I also assume I am trying to turn the inner part in the correct direction. With the chuck held in a vise nose down I try to turn the inner part in a counterclockwise direction. Any suggestions will be appreciated.