itx-aperture-grommet: fix misapprehensions

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/itx-aperture-grommet.scad b/itx-aperture-grommet.scad
index 8bb22c385efca687b8837a0dc4d680c9db472b9a..ee44f4fadef87958b0b4ea6ba95a97388aba3b8d 100644 (file)
--- a/itx-aperture-grommet.scad
+++ b/itx-aperture-grommet.scad
@@ -18,9 +18,9 @@ app_slop = 0.60; // total across both sides
 
 tab_h = tot_height - ap_height;
 
-real_ap_sz = [ ap_width, ap_height ] - app_slop * [ 1,1 ];
-real_main_sz = real_ap_sz + wall_th * [ 2,1 ];
+real_main_sz = [ ap_width, ap_height ] - app_slop * [ 1,1 ];
 real_all_sz = real_main_sz + tab_h * [0,1];
+real_inner_sz = real_main_sz - wall_th * [ 2,1 ];
 
 screw_pos = real_all_sz - (screw_ctr_to_tr - 0.5 * app_slop * [1,1]);