3
1
Back

Grip on the back is probably good // = length of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - thickness*2; left_rib_x = thickness + 9.5/2 + tolerance*2; // rib + half a jack.

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