The five jigs you'll need are so simple you can make them all in a single morning, and cut all the mortises that afternoon. They're designed to work with a plunge router fitted with a 3/4-in. guide bushing and a 1/2-in.-diameter straight bit. An up-cut spiral design works best for mortising (see Sources, page 69).
THE LOWER POST JIG allows you to cut al of the 5/8-in.-wide mortises in the posts. Removable stops adapt the jig for double mortises. This is the only jig that doesn't depend on centerlines for alignment. It mounts flush with the bottom of the post.
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