diff --git a/lawnmower washer.scad b/lawnmower washer.scad
index 9df732f..651fefa 100644
--- a/lawnmower washer.scad	
+++ b/lawnmower washer.scad	
@@ -7,11 +7,14 @@ innerShaftDiameter = 22.30;
 bulbsLength = 32.40;
 bulbsDiameter = 11.60;
 bladeWidth = 44.40 + tolerance;
-washerThickness = 2.00;
-metalWasherThickness = 3.46;
-bladeThickness = 2.24;
+washerThickness = 3.00; // 2.00;
+metalWasherThickness = 4.00; // 3.46;
+bladeThickness = 2.50; // 2.24;
 
-minGuideRidgeThickness = 3.00;
+minGuideRidgeThickness = 8.00; // 3.00;
+
+bladeBumpWidth = bladeWidth * 0.3333;
+bladeBumpHeight = bladeThickness;
 
 innerShaftRadius = innerShaftDiameter / 2;
 bulbRadius = bulbsDiameter / 2;
@@ -19,6 +22,8 @@ washerLength = max(topMetalWasherLength, bladeWidth) + (minGuideRidgeThickness *
 bladeRidgeThickness = max(minGuideRidgeThickness, (washerLength - bladeWidth) / 2);
 metalWasherRidgeThickness = max(minGuideRidgeThickness, (washerLength - topMetalWasherLength) / 2);
 
+bladeBumpOffsetFromCenter = washerLength * 0.375;
+
 circleResolution=360*4; // faces per rotation
 zFightingOffset=0.01; // offset for shape subtraction
 
@@ -32,6 +37,17 @@ module shaft(height) {
         cylinder(r=bulbRadius, h=height, $fn=circleResolution);
 }
 
+module bump(length, width, height) {
+    translate([0, width/2, height])
+        scale([length, width / 2, height])
+            rotate([0, 90, 0])
+                cylinder(r=1, h=1, $fn=circleResolution);
+    translate([0, 0, height])
+        cube([length, width, height + zFightingOffset]);
+}
+
+//bump(washerLength, bladeBumpWidth + zFightingOffset, washerThickness);
+
 difference() {
     translate([-washerLength / 2, -washerLength / 2, 0]) {
         cube([washerLength, washerLength, washerThickness]);
@@ -42,17 +58,33 @@ difference() {
             translate([0, bladeWidth / 2,0])
                 cube([washerLength, bladeRidgeThickness, bladeThickness]);
         }
-        // metal washer ridges
-        translate([washerLength / 2, 0, - washerThickness + zFightingOffset]) {
+        // metal washer ridges (standard)
+        translate([washerLength / 2, 0, - metalWasherThickness + zFightingOffset]) {
             translate([-(topMetalWasherLength / 2) - metalWasherRidgeThickness, 0,0])
                 cube([metalWasherRidgeThickness, washerLength, metalWasherThickness]);
             translate([topMetalWasherLength / 2,0,0])
                 cube([metalWasherRidgeThickness, washerLength, metalWasherThickness]);
         }
+        // metal washer ridges (optional)
+        translate([0, washerLength / 2, - metalWasherThickness + zFightingOffset]) {
+            translate([0, -(topMetalWasherLength / 2) - metalWasherRidgeThickness,0])
+                cube([washerLength, metalWasherRidgeThickness, metalWasherThickness]);
+            translate([0, topMetalWasherLength / 2,0])
+                cube([washerLength, metalWasherRidgeThickness, metalWasherThickness]);
+        }
     }
-    translate([0,0,-zFightingOffset])
+    translate([0,0,-zFightingOffset]) {
+        // shaft
         rotate([0,0,0])
             shaft(washerThickness + (zFightingOffset * 2));
+        // blade shaft bumps
+        translate([0, -bladeBumpWidth/2, washerThickness - bladeBumpHeight]) {
+            translate([-(washerLength + bladeBumpOffsetFromCenter), 0, 0])
+                bump(washerLength, bladeBumpWidth + zFightingOffset, washerThickness);
+            translate([bladeBumpOffsetFromCenter, 0, 0])
+                bump(washerLength, bladeBumpWidth + zFightingOffset, washerThickness);
+        }
+    }
     /*
     // blade stand-in
     translate([-50, -bladeWidth/2, washerThickness])
diff --git a/lawnmower washer.stl b/lawnmower washer.stl
index 5e322c9..12a5019 100644
Binary files a/lawnmower washer.stl and b/lawnmower washer.stl differ
diff --git a/monitor headphone mount.scad b/monitor headphone mount.scad
index 242cbb1..bc067ca 100644
--- a/monitor headphone mount.scad	
+++ b/monitor headphone mount.scad	
@@ -18,13 +18,14 @@ screenBaseThickness = 45.00;
 mountProtrusionFromScreenBack = 33.10;
 headphoneArmLength = 50.00;
 
-miscThickness = 6.00;
+horizontalThickness = 8.00;
+verticalThickness = 6.50;
 
 circleResolution=360*4; // faces per rotation
 
 union() {
-    translate([0, 0, mountToScreenBottomHeight + miscThickness]) mountEnd(miscThickness);
-    headphoneMount(miscThickness);
+    translate([0, 0, mountToScreenBottomHeight + horizontalThickness]) mountEnd(verticalThickness);
+    headphoneMount(horizontalThickness, verticalThickness);
     //mountEnd(miscThickness);
 }
 
@@ -49,31 +50,31 @@ module mountEnd(thickness) {
     }
 }
 
-module headphoneMount(thickness) {
+module headphoneMount(zThickness, yThickness) {
     // stock down from monitor mount to clear bottom of monitor
-    cube([mountWidthEnd, thickness, mountToScreenBottomHeight + thickness]);
+    cube([mountWidthEnd, yThickness, mountToScreenBottomHeight + zThickness]);
     //color("red") cube([mountWidthEnd, thickness + screenBaseThickness + mountProtrusionFromScreenBack, thickness]);
     // quarter circle under monitor
     translate ([mountWidthEnd/2, screenBaseThickness + mountProtrusionFromScreenBack, 0]) difference() {
-        cylinder(r = screenBaseThickness + mountProtrusionFromScreenBack, h = thickness, $fn=circleResolution);
+        cylinder(r = screenBaseThickness + mountProtrusionFromScreenBack, h = zThickness, $fn=circleResolution);
         translate([0,0,-0.01])
-            cylinder(r = (screenBaseThickness + mountProtrusionFromScreenBack) - (mountWidthEnd), h = thickness + 0.02, $fn=circleResolution);
-        translate([-(screenBaseThickness + mountProtrusionFromScreenBack) - 0.01, thickness, -0.01])
-            cube([(screenBaseThickness + mountProtrusionFromScreenBack) * 2.01, (screenBaseThickness + mountProtrusionFromScreenBack), thickness + 0.02]);
+            cylinder(r = (screenBaseThickness + mountProtrusionFromScreenBack) - (mountWidthEnd), h = zThickness + 0.02, $fn=circleResolution);
+        translate([-(screenBaseThickness + mountProtrusionFromScreenBack) - 0.01, yThickness, -0.01])
+            cube([(screenBaseThickness + mountProtrusionFromScreenBack) * 2.01, (screenBaseThickness + mountProtrusionFromScreenBack), zThickness + 0.02]);
         translate([mountWidthEnd/2, -(screenBaseThickness + mountProtrusionFromScreenBack)-0.01, -0.01])
-            cube([screenBaseThickness + mountProtrusionFromScreenBack, screenBaseThickness + mountProtrusionFromScreenBack + thickness+0.02, thickness + 0.02]);
+            cube([screenBaseThickness + mountProtrusionFromScreenBack, screenBaseThickness + mountProtrusionFromScreenBack + yThickness+0.02, zThickness + 0.02]);
     }
     // right angle connection reinforcement quarter circle
     difference() {
-        cube([mountWidthEnd, mountWidthEnd + 0.25, mountWidthEnd + thickness]);
-        translate([-0.01, mountWidthEnd + thickness, mountWidthEnd + thickness])
+        cube([mountWidthEnd, mountWidthEnd + 0.25, mountWidthEnd + zThickness]);
+        translate([-0.01, mountWidthEnd + yThickness, mountWidthEnd + zThickness])
             rotate([0,90,0])
                 cylinder(r = mountWidthEnd * 1.02, h = mountWidthEnd + 0.02, $fn=circleResolution);
     }
     // headphone arm
-    translate([-(screenBaseThickness + mountProtrusionFromScreenBack) + (mountWidthEnd / 2), (screenBaseThickness + mountProtrusionFromScreenBack + thickness), 0]) {
-        cube([mountWidthEnd,headphoneArmLength + thickness,thickness]);
-        translate([0, headphoneArmLength + thickness, 0])
-            cube([mountWidthEnd, thickness, thickness * 2]);
+    translate([-(screenBaseThickness + mountProtrusionFromScreenBack) + (mountWidthEnd / 2), (screenBaseThickness + mountProtrusionFromScreenBack + yThickness), 0]) {
+        cube([mountWidthEnd,headphoneArmLength + yThickness,zThickness]);
+        translate([0, headphoneArmLength + yThickness, 0])
+            cube([mountWidthEnd, yThickness / 2, zThickness * 2]);
     }
 }
\ No newline at end of file
diff --git a/monitor headphone mount.stl b/monitor headphone mount.stl
index 7082379..01d610a 100644
Binary files a/monitor headphone mount.stl and b/monitor headphone mount.stl differ