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Severed. See this image of the rail + a safety margin // margins from edges h_margin = hole_dist_side*4; v_margin = hole_dist_top*2 + thickness; width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of the rail + a safety margin // margins from edges h_margin = hole_dist_side*4; v_margin = hole_dist_top*2.

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