Popular Woodworking 2000-01 № 112, страница 35

1 ⁵/8" drywall screw

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Corner brace "F" is nailed in place then screwed from each end.

Nails

Here's the side piece held in place against the top runner. You want the top runner to be snug against the top of your fence (above left).The triangular braces (above right) keep the side and top runner square and sturdy for years to come.