With some miter-clamping methods, you need to grab a square and make sure the corner is exactly 90 degrees. Not so with corner clamps; they automatically hold parts perfectly square. They're available at home centers and online.
Lee Valley's new Countersunk Washers solve the problem of screw heads splitting stock. The washer/screw combination applies force the same way a pan-head screw does, but is counterbored to a flush position. They're availabe in brass or stainless steel, in
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