I always look for ways to add interesting details to boxes, so I developed a means of  hollowing a dowel to create a “double dowel” joint reinforcement.

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I always look for ways to add interesting details to boxes, so I developed a means of hollowing a dowel to create a "double dowel" joint reinforcement, as shown below.

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To do the same you'll need a doweling jig with replaceable inserts of various diameters. I use a Dowelmax jig.

First, make a disposable wood fixture to hold the dowels for hollowing by placing 38 " drill guides in the jig and drill 112 " deep into the end of a scrap board. Then add a drop of cyanoacrylate glue to one end only of 38 " dowels 112 " long, and use a longer dowel to press the dowels to the bottom of each hole.

Next, place 14 " drill guides in the jig and redrill the holes with a 14 " bit. Crosscut the board about 114 " from the end. Use a 38 " dowel to push out the hollow dowels.

After inserting a hollow dowel in a joint, you can fill it with contrasting wood, brass or aluminum rod, or epoxy.
—Jeff Baenen, Kenosha, Wis.