I am refinishing the stock on an old CVA kit gun and after reshaping the stock to fit the buttplate and sanding the entire stock to remove the finish I find that there are shaded areas of the stock where the original stain is still showing through. I don't dare sand these areas anymore as I'm afraid of removing too much wood. Is there anything I can do to either remove this stain or try to somehow blend the new finish in so thst it looks somewhat even all over?