Building the Keyframe

Cut the rabbets and dados by whatever means is comfortable – router, table saw, etc. Check the fit by placing the balance rail and back rail in the dados and rabbets. The fit should be snug. The rear edge of the back rail should be flush with the rear edge of the stiles.

If the fit of the balance rail in the dado is too tight, plane a shaving off of its front edge – do not widen the dado itself unless you’re certain the dado was cut less than the required 2 ¼” [57mm] to begin with.