Trimming the Keyboard Blank
Before we can orient the two blanks to each other, the keyboard blank must be trimmed on the right (treble) end. Extend the right edge of the highest key (D) all the way to the rear of the keyboard blank. Trim off everything to the right of that line as shown in red in the illustration below. The keyboard should now be 27 55/64" [707.63mm] wide - or very close to it. After you trim off the waste, measure the exact width of the keyboard and make note of it if you haven't already done so. The balance rail and back rail must be cut to this measurement plus 1/4" [6.3mm]. Make these cuts to the balance rail and back rail now.
