speed hole                
                                
                                          
 turn  your walkman like a turtle.  there 
 might  be  something  there  that  looks 
 like  a  screw hole  but  it could be  a 
               speed hole.                
 the  rule   is  if   you  can't   get  a 
  reasonably small screwdriver in there,  
          it's not a screw hole.          
                                          
                 usage                  
                                          
 use the  speed  hole like  a  screw hole 
      but with a tinier screwdriver       
                                          
                  this                  
                adjusts                 
                  the                   
                pitch                 
                                          
 some cassette players have  speed screws 
 but no holes for  them. to get to  those 
 screws  you  need  to  dissasemble   the 
 whole   thing.   could   be   worth   it