diff --git a/README.md b/README.md
index c4353c0..2a5c1b2 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ but beware of PLA's thermal limits. Higher infill is recommended for all parts.
 A python script: `rbuild.py` is provided to generate different project stls.
 
 Requirements:
-  - `openscad` cli command (Only runs on Linux)
+  - `openscad` cli (Currently only supported on Linux/Mac)
   - `python3`
 
 ### Examples:
diff --git a/TODO.md b/TODO.md
index c0d25e5..350e6a6 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,15 +2,14 @@
 
 ### Actual TODO
 
-- Finish refactoring files to use the application style, like in `yBar.scad` 
-- Implement better build script using python !!!
-- Start working on actual cases
+- Finish refactoring files to use the application style, like in `yBar.scad`
 - Figure out why sidewall build is so slow
-- Tidy up imports
 - Standardize meaning of `U`
+- Standardize negative naming convention
+- Clean up `sharedVariables.scad`!!!
+- Implement instruction generation with rbuild.
 
 ### Ideas
-- Clean up `sharedVariables.scad`!!!
 - Start using matrices for transformations. Enforce strict local/global hierarchy of matrix transformations.
 - Instead of using names like 'mainRailSlotToInnerYZFace', experiment with a central distance/dimension directory. Like:
 ```openscad
diff --git a/helper/screws.scad b/helper/screws.scad
index 6322050..abceccc 100644
--- a/helper/screws.scad
+++ b/helper/screws.scad
@@ -1,5 +1,6 @@
 /* Some common screw dimensions and helper functions/modules */
 
+include <../helper/common.scad>
 include <./math.scad>
 
 /********************************************************************************/
@@ -175,22 +176,22 @@ module hexNutPocketHelper_N(innerRadius, widthAcrossCorners, thickness, openSide
       if (bridgeFront) {
         union() {
           // first bridge layer
-          translate(v=[0,0,thickness/2 + 0.2/2])
-          cube(size=[2*innerRadius, GtoF(widthAcrossCorners)*2, 0.2], center=true);
-
-          translate(v=[0,0,thickness/2+ 0.3])
-          cube(size=[2*innerRadius, 2*innerRadius, 0.2], center=true);
+          translate(v=[0,0,thickness/2 + defaultLayerHeight/2])
+          cube(size=[2*innerRadius, GtoF(widthAcrossCorners)*2, defaultLayerHeight], center=true);
+          // second bridge layer
+          translate(v=[0,0,thickness/2 + defaultLayerHeight])
+          cube(size=[2*innerRadius, 2*innerRadius, defaultLayerHeight], center=true);
         }
       }
 
       if (bridgeBack) {
         union() {
           // first bridge layer
-          translate(v=[0,0,-(thickness/2 + 0.2/2)])
-          cube(size=[2*innerRadius, GtoF(widthAcrossCorners)*2, 0.2], center=true);
-
-          translate(v=[0,0,-(thickness/2+ 0.3)])
-          cube(size=[2*innerRadius, 2*innerRadius, 0.2], center=true);
+          translate(v=[0,0,-(thickness/2 + defaultLayerHeight/2)])
+          cube(size=[2*innerRadius, GtoF(widthAcrossCorners)*2, defaultLayerHeight], center=true);
+          // second bridge layer
+          translate(v=[0,0,-(thickness/2 + defaultLayerHeight)])
+          cube(size=[2*innerRadius, 2*innerRadius, defaultLayerHeight], center=true);
         }
       }
     }
diff --git a/rack-mount/print/patchPanel_P.scad b/rack-mount/print/patchPanel_P.scad
index c62e048..1f6602b 100644
--- a/rack-mount/print/patchPanel_P.scad
+++ b/rack-mount/print/patchPanel_P.scad
@@ -1,3 +1,5 @@
 use <../patchPanel.scad>
 
+
+mirror(v=[0,0,1])
 patchPanel(slots=8);
diff --git a/stl/micro/rack/yBar_P.stl b/stl/micro/rack/yBar_P.stl
index a5231d3..b065017 100644
Binary files a/stl/micro/rack/yBar_P.stl and b/stl/micro/rack/yBar_P.stl differ