Outlining the Key Fronts
Draw a line exactly 1 1/8” [28.5mm] up from the front edge of the keyboard blank. Label this line ‘Line HI’. Draw a second line exactly 3 15/16” [100mm] up from the front edge of the blank. Label it ‘Line JK’. Draw a third line exactly 4 15/16” [125.4mm] up from the front edge of the blank. Label this line ‘Line LM’. Your keyboard blank should look like this.
