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Warning about wood dust exposure from machining, known carcinogen, and recommended protection.
Select auxiliary jaws matching frame stock and attach using hex screws and wrench if needed.
Support stock, position angle adjustment knobs to 90°, and slide frame pieces together.
Slightly rotate angle adjustment knobs simultaneously to close gaps in frame miters.
Apply glue after dry clamping, engage the large clamp knob, and fasten with glue or fasteners.