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Set screw hole's center over the base of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2 + thickness; col_left = h_margin; bottom_row = v_margin + 12; //knob_radius top_row = height - 25; // build up seven rows; middle one unused row_1 = bottom_row + v_margin + 12; row_1 = bottom_row + v_margin + 12; //knob_radius top_row = height - rail_clearance - thickness*2 - 16.5/2; // 16.5 is the decade counter Bergman's 10-step.

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