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There was another Online Extra for this article:
Issue 105 Online Extra
Setting Up Lock Miter Bits
Using a lock miter bit in the router table is a great way to create strong, interlocking miter joints. Setting up the bit just right takes a few test cuts. But sometimes, it's difficult to know just what adjustments to take. This SketchUp file shows several scenarios and helps you diagnose what's wrong.
This 3-D SketchUp model is available to download in this Online Extra.
(See download link above)