Rear Support

The keyboard blank is now contacting the key frame only at the balance rail. To give it more support, cut a 5/16” [7.9mm] thick strip of scrap wood and slip it underneath the rear of the keyboard to fill in the space between it and the key frame. No need to nail it in. When the time comes to drill the back rail holes, leave this support strip in and drill right through it into the back rail.