How to Cut Tongue-and-Groove Joints
Tongue-and-groove joints are commonly made on a table saw. But with the right bits, the joints can be made just as easily on a router table.
After gluing the the two pieces of wood in position with wood glue and holding the joint until it's reasonable stable, drill two pilot holes through the joint so the wood doesn't split. The holes must be the same size as the dry-wall screws.
Insert the screwdriver shank into the holes, making sure that it will pass without binding. Drive the dry-wall screws into the pilot holes, countersinking the heads in the wood base. Clean up any excess glue. Fill screwhead holes with wood filler.
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