Editing Step 12 —
Place the top frame square

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Assembly with the vertical extrusions

Frame square assembly.

Tigthen the M6x8 set screws.

Ensure the corner assemblies are flush and square with the ends of the extrusions after tightening the screws.

Repeat for all 4 corners.

Be careful while tightening the set screws, extreme force may break the three way hidden corner.

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