diff --git a/libtest.png b/libtest.png
index a319a98..5bde211 100644
Binary files a/libtest.png and b/libtest.png differ
diff --git a/tests/png/screws.png b/tests/png/screws.png
index 17b7ac6..b2217a1 100644
Binary files a/tests/png/screws.png and b/tests/png/screws.png differ
diff --git a/tests/screws.scad b/tests/screws.scad
index 2cb1ad8..1376fd3 100644
--- a/tests/screws.scad
+++ b/tests/screws.scad
@@ -25,16 +25,16 @@ module polysink_stl() {
     n = len(cs_screws);
     size = [n * 20, 20, 10];
     difference() {
-        translate([-size.x / n / 2, $preview ? 0 : -size.y / 2, -size.z])
+        translate([-size.x / n / 2, $preview ? 0 : -size.y / 2])
             cube($preview ? [size.x, size.y / 2, size.z] : size);
 
         for(i = [0 : n - 1])
             let(s = cs_screws[i])
                 translate([i * 20, 0]) {
-                    screw_polysink(s, 2 * size.z + 1);
+                    translate_z(size.z)
+                        screw_polysink(s, 2 * size.z + 1);
 
-                    translate_z(-size.z)
-                        screw_polysink(s, 2 * size.z + 1, alt = true);
+                    screw_polysink(s, 2 * size.z + 1, alt = true);
                 }
     }
 }
@@ -52,7 +52,7 @@ module screws() {
                     screw(screw, length);
             }
         }
-        translate([80, 140])
+        translate([80, 20])
             polysink_stl();
 }