diff --git a/models/lomo_bottom_screw/lomo_bottom_screw.scad b/models/lomo_bottom_screw/lomo_bottom_screw.scad
index 927144d..431db0f 100644
--- a/models/lomo_bottom_screw/lomo_bottom_screw.scad
+++ b/models/lomo_bottom_screw/lomo_bottom_screw.scad
@@ -1,13 +1,16 @@
 t = 0;
 include <../../libraries/threads.scad>;
 
+FINE = 60;
+
 module base () {
-    $fn = 100;
+    $fn = FINE;
     BUMP = 2;
     BUMPS = 6;
     TOP_H = 9.5;
     union() {
         translate([0, 0, -15])cylinder(r = 8.45, h = 20, center = true);
+        //hex top
         //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 = TOP_H, center = true); 
         for (i = [0 : BUMPS]) {
@@ -19,17 +22,21 @@ module base () {
 module lomo_bottom_screw () {
     difference () {
         base();
-        //
-        translate([0, 0, -20]) cylinder(r = 14 / 2, h = 20, center = true, $fn = 100);
+        //negative cylinder (reference)
+        //translate([0, 0, -20]) cylinder(r = 13.6 / 2, h = 20, center = true, $fn = 100);
+        
+        //negative plug (reference)
+        //translate([0, 0, -20]) cylinder(r = 12 / 2, h = 20, center = true, $fn = FINE);
+        translate([0, 0, -30]) metric_thread (diameter=13.6, pitch=1.5 ,thread_size = 1.6, length = 20);
     }
 
     difference () {
         //outer screw
-        translate([0, 0, -7.1]) metric_thread (diameter=10, pitch=1.5, length=27.1);
+        //translate([0, 0, -7.1]) metric_thread (diameter=10, pitch=1.5, length=27.1);
         //taper top of screw
         translate([0, 0, 19]) difference() {
-            cylinder(r = 8, h = 3.5, center = true, $fn = 100);
-            cylinder(r1 = 6, r2 = 3, h = 4.5, center = true, $fn = 100);
+            cylinder(r = 8, h = 3.5, center = true, $fn = FINE);
+            cylinder(r1 = 6, r2 = 3, h = 4.5, center = true, $fn = FINE);
         }
         //hollow center
         cylinder(r = 3.8 / 2, h = 100, center = true, $fn = 60);
@@ -40,11 +47,13 @@ difference() {
 	//center
 	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);
+    translate([-25, 0, 29]) cube([50, 50, 100], center = true);
 }
 
+//translate([0, 0, 7]) cylinder(r = 13.6 / 2, h = 20, center = true, $fn = 100);
+        
 translate([0, 0, -20]) rotate([0, 0, t]) difference() {
-    rotate([0, 180, 0]) import("../lomo_top_screw/lomo_top_screw.stl");
+   // rotate([0, 180, 0]) import("../lomo_top_screw/lomo_top_screw.stl");
     //translate([-100, 0, 0])cube([200, 200, 200], center = true);
 }