diff --git a/tests/png/ball_bearings.png b/tests/png/ball_bearings.png
index a3a50ef..7c872a3 100644
Binary files a/tests/png/ball_bearings.png and b/tests/png/ball_bearings.png differ
diff --git a/tests/png/kp_pillow_blocks.png b/tests/png/kp_pillow_blocks.png
index 6cbdaa7..3196c7f 100644
Binary files a/tests/png/kp_pillow_blocks.png and b/tests/png/kp_pillow_blocks.png differ
diff --git a/vitamins/ball_bearing.scad b/vitamins/ball_bearing.scad
index a585fbd..d55ed4f 100644
--- a/vitamins/ball_bearing.scad
+++ b/vitamins/ball_bearing.scad
@@ -52,21 +52,21 @@ module ball_bearing(type) { //! Draw a ball bearing
         rim_chamfer = rim / 6;
         rotate_extrude()
             hull() {
-                translate([or - rim / 2, 0])
-                    square([rim, h - 2 * rim_chamfer], center = true);
+                translate([or - rim, -h / 2 + rim_chamfer])
+                    square([rim, h - 2 * rim_chamfer]);
 
-                translate([or - rim / 2 - rim_chamfer, 0])
-                    square([rim - rim_chamfer, h], center = true);
+                translate([or - rim, -h / 2])
+                    square([rim - rim_chamfer, h]);
             }
 
         hub_chamfer = hub / 6;
         rotate_extrude()
             hull() {
-                translate([ir + hub / 2, 0])
-                    square([hub, h - 2 * hub_chamfer], center = true);
+                translate([ir, -h / 2 + hub_chamfer])
+                    square([hub, h - 2 * hub_chamfer]);
 
-                translate([ir + hub / 2 + hub_chamfer, 0])
-                    square([hub - hub_chamfer, h], center = true);
+                translate([ir + hub_chamfer, -h / 2])
+                    square([hub - hub_chamfer, h]);
             }
     }