diff --git a/readme.md b/readme.md
index 51ec0c1..e62a146 100644
--- a/readme.md
+++ b/readme.md
@@ -2601,7 +2601,7 @@ SK shaft support brackets
 |   1 | ```sk_bracket(SK12)``` |  SK12 shaft support bracket |
 |   1 | ```sk_bracket(SK16)``` |  SK16 shaft support bracket |
 |   1 | ```sk_bracket(SK8)``` |  SK8 shaft support bracket |
-|   2 | ```screw(M4_cap_screw, 16)``` |  Screw M4 cap x 16mm |
+|   2 | ```screw(M4_cap_screw, 12)``` |  Screw M4 cap x 12mm |
 |   6 | ```screw(M5_cap_screw, 16)``` |  Screw M5 cap x 16mm |
 |   2 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
 |  10 | ```washer(M5_washer)``` |  Washer  M5 x 10mm x 1mm |
diff --git a/tests/png/sk_brackets.png b/tests/png/sk_brackets.png
index e60bac7..015d1c9 100644
Binary files a/tests/png/sk_brackets.png and b/tests/png/sk_brackets.png differ
diff --git a/vitamins/sk_bracket.scad b/vitamins/sk_bracket.scad
index 03c3353..853cb3e 100644
--- a/vitamins/sk_bracket.scad
+++ b/vitamins/sk_bracket.scad
@@ -110,7 +110,8 @@ module sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw,
     nut_washer_thickness = nut_washer_type ? washer_thickness(nut_washer_type) : 0;
 
     nut_offset = sk_base_height(type) + part_thickness;
-    screw_length = screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type));
+    screw_length = nut_washer_type ? screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type))
+                                   : screw_shorter_than(nut_offset + screw_washer_thickness + nut_thickness(nut_type) + 2);
 
     sk_bracket_hole_positions(type) {
         screw_and_washer(screw_type, screw_length);