diff --git a/models/lomo_bottom_screw/lomo_bottom_screw.scad b/models/lomo_bottom_screw/lomo_bottom_screw.scad
index 270b9e3..15be5ac 100644
--- a/models/lomo_bottom_screw/lomo_bottom_screw.scad
+++ b/models/lomo_bottom_screw/lomo_bottom_screw.scad
@@ -1,69 +1,90 @@
 t = 0;
 include <../../libraries/threads.scad>;
 
-FINE = 60;
+//RESOLUTION
+FINE = 200;
 
-module base () {
-    $fn = FINE;
-    BUMP = 2;
-    BUMPS = 6;
-    TOP_H = 9.5;
+module base ( HEX = false) {
+	D = 8.45 * 2;
+	H = 20;
+	//for grip
+	BUMP = 2; //diameter
+	BUMPS = 6;
+	TOP_D = 19;
+	TOP_H = 9.5;
+	TOP_OFFSET = -24.5;
+	
     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); 
+        translate([0, 0, -15]) {
+			cylinder(r = D / 2, h = H, center = true, $fn = FINE);
+		}
+        //hex version
+		if (HEX) {
+			translate([0, 0, TOP_OFFSET]) {
+				cylinder(r = 11.1, h = TOP_H, center = true, $fn = 6);
+			}
+		} else {
+			translate([0, 0, TOP_OFFSET]) {
+				cylinder(r = TOP_D / 2, h = TOP_H, center = true, $fn = FINE); 
+			}
+		}
         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);
+            rotate([0, 0, (360 / BUMPS) * i]) {
+				translate([0, 8.9, TOP_OFFSET]) {
+					cylinder(r = BUMP, h = TOP_H, center = true, $fn = 60);
+				}
+			}
         }
     }
 }
 
-module lomo_bottom_screw (LEN = 27.1) {
+module outer_screw (LEN) {
+	OD = 10;
+	PITCH = 1.5;
+	THREAD = 1.6;
+	
+	difference () {
+		translate([0, 0, -7.1]) metric_thread (diameter=OD, pitch=PITCH, thread_size = THREAD, length=LEN);
+        //bevel top of screw
+        translate([0, 0, LEN - 8]) difference() {
+            cylinder(r = 8, h = 3, center = true, $fn = FINE);
+            cylinder(r1 = 6, r2 = 3, h = 3.01, center = true, $fn = FINE);
+        }
+	}
+}
+
+module lomo_bottom_screw (ALT = false, HEX = false) {
+	OD = 13.6 + .5;
+	PITCH = 1.5;
+	THREAD = 1.6;
+	IN_LEN = 21;
+	
+	LEN = 17.1;
+	ALT_LEN = 27.1;
     difference () {
-        base();
-        //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);
+        base(HEX);
+		//inner screw negative
         translate([0, 0, -30]) union() {
-            metric_thread (diameter=13.6 + .5, pitch=1.5, thread_size = 1.6, length = 21);
-            translate([0, 0, 0.2]) metric_thread (diameter=13.6 + .5, pitch=1.5, thread_size = 1.6, length = 21);
+            metric_thread (diameter=OD, pitch=PITCH, thread_size = THREAD, length = IN_LEN);
+            translate([0, 0, 0.2]) {
+				metric_thread (diameter=OD, pitch=PITCH, thread_size = THREAD, length = IN_LEN);
+			}
         }
    }
 
     difference () {
         //outer screw
-        translate([0, 0, -7.1]) metric_thread (diameter=10, pitch=1.5, length=LEN);
-        translate([0, 0, 26]) cylinder(r = 8, h = 5, center = true, $fn = FINE);
-        //taper top of screw
-        translate([0, 0, LEN - 4.2]) difference() {
-            cylinder(r = 8, h = 3, center = true, $fn = FINE);
-            cylinder(r1 = 6, r2 = 3, h = 3.01, center = true, $fn = FINE);
-        }
+		if (ALT) {
+			outer_screw(ALT_LEN);
+		} else {
+			outer_screw(LEN);
+		}
         //hollow center
         cylinder(r = 3.8 / 2, h = 100, center = true, $fn = 60);
     }
     
 }
-difference() {
-    //color("green")
-	//center
-	translate([0, 0, 29]) lomo_bottom_screw();
- 
-    //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() {
-
-    //translate([-100, 0, 0])cube([200, 200, 200], center = true);
-}
-
-translate([0, 0, -30]) {
-    //metric_thread (diameter=13.6, pitch=1.5 ,thread_size = 1.6, length = 20);
-}
+translate([0, 0, 29]) rotate([0, 0, t]) lomo_bottom_screw();