Here's a photo of a jig I put together to make it easy to use my plunge router to create sockets for half-blind carcase dovetails. As the photo shows, the jig is made from common cut-offs, including a length of 2x4 and a throw-away sacrificial fence. Two 3/8" carriage bolts (6" long) and matching wing-nuts are the only hardware used. In the photo, the long piece in the vise is the workpiece. You can see the sockets marked out on the upper edge. After ensuring that the router has a flat surface to ride on, and that the open end of the sockets faces the operator, careful handling of the router (I use a 1/4" spiral up-cut bit) all but competes the sockets. A little chiseling is needed to ensure crisp inside corners.
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