The Purpose of Bi-Color Erasers. Notice how some erasers are soft and pink on one side and firm, gritty, and blue on the other? Some say that the blue is for erasing pen but that doesn't really work. The best answer we've found is that it is used for darker pencil marks and papers of heavy weight and different textures (grainy art paper, for example).
This shit again?
again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again and again ...
#14 That hole is used to extract the key lock when the key is in it so you can rekey the lock to another key - you oil the lock through the key slot. That's where the pins are.