diff --git a/model/fourbar.scad b/model/fourbar.scad
index aa8e814..84a4fbd 100644
--- a/model/fourbar.scad
+++ b/model/fourbar.scad
@@ -35,11 +35,30 @@ module fourbar_leg(length=1000, chord=100, long_skew=30, lat_skew=30) {
 
 
 module lower_knuckle(chord=100, pivot_radius=12) {
+    l_body=chord * 1.5;
+    w_body=pivot_radius * 2.5;
+    h_axis=pivot_radius * 3;
+        
     difference() {
-        cube([chord * 1.5, pivot_radius * 3, chord*.66]);
-        translate([ chord*0.25, -1, pivot_radius * 2])
+        union () {
+            translate([0, w_body/2, h_axis])
+                rotate([0, 90, 0])
+                    cylinder(h=l_body, r=w_body/2);
+            cube([l_body, w_body, h_axis]);
+            translate([chord * 1.25, w_body, 0])
+                rotate([90, 0, 0])
+                    cylinder(h=w_body, r=pivot_radius * 2);
+        }
+        translate([ chord*0.25, -1, pivot_radius * 3])
             cube([chord, pivot_radius * 4, pivot_radius * 4]);
-    }
+        translate([ chord*0.25, w_body/2, h_axis])
+            rotate([0, 90, 0])
+                cylinder(h=chord, r=pivot_radius * 1.5);
+        // throough hole for pivot axle
+        translate([-1, w_body/2, h_axis])
+            rotate([0, 90, 0])
+            cylinder(h=l_body+2, r=pivot_radius/3);   
+    } 
 }
 
 module fourbar_axle_half( length, chord, long_skew) {
@@ -100,6 +119,16 @@ module fourbar(length=1000, chord=100, long_skew=30, lat_skew=30, shoulder=650)
         fourbar_axle_half(w, chord, long_skew);
 }
 
-// lower_knuckle();
+translate([-125, 0, 0])
+    color("blue")
+    lower_knuckle();
+/* translate([0, 77, 0])
+    rotate([270, 0, 0]) 
+    wheel();*/
+translate([0, 40, 0])
+    color("silver")
+    rotate([90, 0, 0])
+    cylinder(h=1.5, r=75);
+
 // fourbar();
 // fourbar_axle_half(1000,100, 30);
\ No newline at end of file