Answer by  
                                                                                          McCheese (1248)
                                                            
                          
                          
                                                          You're better off getting a professional to work with the Hermle, because the wrong hands can do quite a bit of damage if it is handled too rough.  There is a large network of Hermle dealers that carry special tools to fit the Grandfather Clocks.  If you don't want to hire them, at least rent the correct tools!