Drawing the Rear of the Keys
The next step is to draw in the rear of the keys. Using a speed square, draw lines from your marks on the rear edge of the key blank straight down to line NO. Blacken out the 17/32ā [13.4mm] space at the left of the blank, and the space after the last key on the right of the blank. Blacken out the area to the right of the highest āDā key from line HI to line LM. These are waste areas which will eventually be cut out. Your key blank should look like the following illustration.
