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