code: public RedwoodConfiguration splice(final LogRecordHandler parent, final LogRecordHandler toAdd, final LogRecordHandler grandchild){
      tasks.add(new Runnable() { public void run() { Redwood.spliceHandler(parent, toAdd, grandchild);} });
      return this;
    }
docs: Add a handler to as a child of an existing parent
  @param parent The handler to extend
  @param toAdd The new handler to add
  @param grandchild The subtree to attach to the new handler
  @return this