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