Describir: Plastics reference notebook, part 12- mechanical joining methods

 ______      ___      _____      ___      _____    _    _     ______  
|      \\   / _ \\   / ____||   / _ \\   / ____|| | || | ||  /_   _// 
|  --  //  | / \ || / //---`'  / //\ \\ / //---`' | || | ||    | ||   
|  --  \\  | \_/ || \ \\___   |  ___  ||\ \\___   | \\_/ ||   _| ||   
|______//   \___//   \_____|| |_||  |_|| \_____||  \____//   /__//    
`------`    `---`     `----`  `-`   `-`   `----`    `---`    `--`     
                                                                      
   ___    
  / _ \\  
 / //\ \\ 
|  ___  ||
|_||  |_||
`-`   `-`