diff --git a/models/lomo_bottom_screw/lomo_bottom_screw.scad b/models/lomo_bottom_screw/lomo_bottom_screw.scad
index 134f5ad..927144d 100644
--- a/models/lomo_bottom_screw/lomo_bottom_screw.scad
+++ b/models/lomo_bottom_screw/lomo_bottom_screw.scad
@@ -3,15 +3,26 @@ include <../../libraries/threads.scad>;
 
 module base () {
     $fn = 100;
+    BUMP = 2;
+    BUMPS = 6;
+    TOP_H = 9.5;
     union() {
         translate([0, 0, -15])cylinder(r = 8.45, h = 20, center = true);
         //translate([0, 0, -24.5])cylinder(r = 11.1, h = 9.5, center = true, $fn = 6);
-		translate([0, 0, -24.5]) cylinder(r = 19 / 2, h = 9.5, center = true); 
+		translate([0, 0, -24.5]) cylinder(r = 19 / 2, h = TOP_H, center = true); 
+        for (i = [0 : BUMPS]) {
+            rotate([0, 0, (360 / BUMPS) * i]) translate([0, 8.9, -24.5]) cylinder(r = BUMP, h = TOP_H, center = true, $fn = 60);
+        }
     }
 }
 
 module lomo_bottom_screw () {
-    //base();
+    difference () {
+        base();
+        //
+        translate([0, 0, -20]) cylinder(r = 14 / 2, h = 20, center = true, $fn = 100);
+    }
+
     difference () {
         //outer screw
         translate([0, 0, -7.1]) metric_thread (diameter=10, pitch=1.5, length=27.1);
@@ -27,11 +38,14 @@ module lomo_bottom_screw () {
 difference() {
     //color("green")
 	//center
-	//cylinder(r = 3 / 2, h = 100, center = true, $fn = 30);
-    translate([37, -3.25, 0]) import("./lomo_part_fixed.stl");
-    translate([200, 0, 0]) cube([400, 400, 400], center = true);
+	translate([0, 0, 29]) lomo_bottom_screw();
+    //translate([37, -3.25, 0]) import("./lomo_part_fixed.stl");
+    translate([-50, 0, 29]) cube([100, 100, 100], center = true);
 }
-rotate([0, 0, t]) difference() {
-    lomo_bottom_screw();
-    translate([-100, 0, 0])cube([200, 200, 200], center = true);
+
+translate([0, 0, -20]) rotate([0, 0, t]) difference() {
+    rotate([0, 180, 0]) import("../lomo_top_screw/lomo_top_screw.stl");
+    //translate([-100, 0, 0])cube([200, 200, 200], center = true);
 }
+
+