diff --git a/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/disk-slider_POC-redesign.scad b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/disk-slider_POC-redesign.scad
index 9efdddf..c1c2081 100644
--- a/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/disk-slider_POC-redesign.scad
+++ b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/disk-slider_POC-redesign.scad
@@ -168,7 +168,7 @@ module clip_wide(){
 }
 
 
-module clip_rear_base(){
+module clip_rear_base(post_h=post_h){
     translate([0,slide_base_l/2-slide_base_l/2.5,slide_bottom_t/2+mt*1.5]){
         difference(){
             union(){
@@ -236,6 +236,7 @@ module linkage(){
         
         cylinder(r=2,h=1.5+q,center=true,$fn=100);
     }
+    
 }
 
 module base_end(){
@@ -243,11 +244,20 @@ module base_end(){
         slider_base();
         translate([0,slide_base_l/2+slide_base_l/7,0])cube([slide_base_w+q,slide_base_l+q,slide_base_h*2+q],center=true);
     }
-    clip_rear_base();
+    clip_rear_base(4);
+    
+    translate([0,-35,-3.75])clip_rear_base(10);
+    // stackable washer
+    translate([0,-22,10])difference(){
+        cylinder(r=slide_base_hole_dia+mt,h=2,center=true);
+        cylinder(r=rod_hole_dia,h=3+q,center=true);
+        }
+
     linkage();
 };
 // #####################################
 //drawer_mockup();
+/**
 difference(){
     union(){
         translate([13,draw_l_front+5.5,0]){
@@ -263,7 +273,7 @@ difference(){
 translate([13,draw_l_front+5.5,5])clip_small();
 translate([13,draw_l_front+5.5,10])clip_wide();
 translate([-(draw_w_inner/2-filler_w/2-slack/2),draw_l_front+draw_l_inner/2-5,slide_wall_z_offset])color("pink")slider_filler();
-
+**/
 translate([13,draw_l_front-25.5,0])base_end();
 
 
diff --git a/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.png b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.png
new file mode 100644
index 0000000..18bfa00
Binary files /dev/null and b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.png differ
diff --git a/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.stl b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.stl
new file mode 100644
index 0000000..e2c68d2
Binary files /dev/null and b/openscad/own/supermicro_sc808t/ssd-diskshelf_slider/iteration4_poc/disk-slider_POC-redesign_endsection_complete.stl differ