For parts with mitered ends, such as picture-frame sides, use a stopblock with the complementary angle.
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MiteredParts

For parts with mitered ends, such as picture-frame sides, use a stopblock with the complementary angle. This provides a more positive "lock" than a rectangular block. Apply 120-grit, self-adhesive sandpaper to the miter-gauge extension for better grip on your workpieces.
—from the WOOD shop