This is a badge bit (BB) that is part of the 
PEP curriculum.  Completing this BB is part of getting the straw badge in 
tool care. 
 
 Here is a video on how to sharpen a bow saw.
 
             
                
            
 
 From the video description:
 "By popular demand, the voice over version! In 2½ minutes, you can learn how to sharpen a bow saw."
 
 To get certified for this BB, post the following: 
 
   - Closeup pic of dull tooth
   - Action pic of sharpening a tooth
   - Closeup pic of sharp tooth