diff --git a/3dprint/panel.scad b/3dprint/panel.scad
index f7c4a91..a59a7cb 100644
--- a/3dprint/panel.scad
+++ b/3dprint/panel.scad
@@ -47,6 +47,7 @@ module screw_point(c_x, c_y, length = 5) {
         cylinder(r=5.6/2+1, h=length);
         translate([0, 0, -epsilon])
         cylinder(r=(5.6+wiggle_room)/2, $fn=6, h=2+epsilon+wiggle_room);
+        cylinder(r=(2.5+wiggle_room)/2, h=length-2);
     }
 }
 
@@ -100,6 +101,8 @@ module panel() {
             screw_point(61*2.54, 2.5*2.54);
             screw_point(2*2.54, 37.5*2.54, length=14);
             screw_point(61*2.54, 37.5*2.54, length=14);
+            // stiffness
+            translate([0, 61, -3]) cube([panel_width, 4, 3]);
         }
         translate([0, 0, -cutout_depth+panel_thick-epsilon]) union() {
             // HDG led
@@ -137,13 +140,13 @@ module panel() {
             for (col = [0, 1.5, 2.5, 3.5, 4.5, 6]) {
                 // APR, LVL, FD, AP, A/T, N1
                 cutout_cyl(col_x(col), row_2_led_y, led_diam);
-            }
+            }            
         }
     }
-    translate([0, (panel_border-bottom_border)/2, 0]) rotate([0, 90, 0])  screw_block();
-    translate([0, 100+panel_border+top_border/2-3, 0]) rotate([0, 90, 0]) screw_block();
-    translate([panel_width, (panel_border-bottom_border)/2, -6]) rotate([0, -90, 0])  screw_block();
-    translate([panel_width, 100+panel_border+top_border/2-3, -6]) rotate([0, -90, 0])  screw_block();
+    translate([0, (panel_border-bottom_border)/2+3, 0]) rotate([0, 90, 0])  screw_block(height=6);
+    translate([0, 100+panel_border+top_border/2, 0]) rotate([0, 90, 0]) screw_block();
+    translate([panel_width, (panel_border-bottom_border)/2+3, 0]) rotate([180, 90, 0])  screw_block(height=6);
+    translate([panel_width, 100+panel_border+top_border/2, 0]) rotate([180, 90, 0])  screw_block();
     
     //color("green") translate([panel_border, panel_border, -12]) cube([160, 100, 1]); // dummy PCB
     translate([0, -bottom_border, 0]) cube([panel_width, bottom_border, panel_thick]);
@@ -153,16 +156,33 @@ module panel() {
                  [0, panel_height+top_border+panel_thick/tan(panel_angle)+epsilon]]);
 }
 
-module screw_block() {
+module screw_block(height = 5) {
+    difference() {
+        //cylinder(r=5.6/2+1, h=6);
+        translate([0, -3, 0]) cube([height, 6, 7]);
+        translate ([5.6/2, 0, 0]) {
+            translate([0, 0, -epsilon])
+            rotate([0, 0, 180/6]) cylinder(r=(5.6+wiggle_room)/2, $fn=6, h=2+epsilon+wiggle_room);
+            cylinder(r=(2.5+wiggle_room)/2, h=6);
+        }
+    }
+    /*
     difference() {
         cube([6, 6, 12]);
         translate([3, 3, -epsilon]) cylinder(r=1.25+wiggle_room/2, h=10+epsilon);
-    }
+    }*/
 }
 
-side_screw_head_diam = 5.9+wiggle_room;
-side_screw_shaft_diam = 3+wiggle_room;
-side_screw_head_height = 2.7;
+side_screw_head_diam = 4+wiggle_room;
+side_screw_shaft_diam = 2.5+wiggle_room;
+side_screw_head_height = 1.1;
+
+module sidescrew_hole() {
+    translate([0, 0, -1*side_screw_head_height+2*epsilon]) 
+              cylinder(r=side_screw_head_diam/2, h=side_screw_head_height);
+    translate([0, 0, -panel_thick])
+              cylinder(r=side_screw_shaft_diam/2, h=panel_thick);
+}
 
 module side(rightside = false) {
     difference() {
@@ -179,21 +199,17 @@ module side(rightside = false) {
         rotate([panel_angle, 0, 0]) {
            translate([0, (panel_border-bottom_border)/2, 0]) rotate([0, 90, 0])
             if (rightside) {
-                translate([3, 3, -epsilon-panel_thick]) 
-                cylinder(r1=side_screw_shaft_diam/2, r2=side_screw_head_diam/2, h=side_screw_head_height);
+                translate([3, 3, 0]) sidescrew_hole();
             } else {
-                translate([3, 3, 2*epsilon-side_screw_head_height]) 
-                cylinder(r2=side_screw_shaft_diam/2, r1=side_screw_head_diam/2, h=side_screw_head_height);
+                translate([3, 3, -panel_thick+2*epsilon]) rotate([0, 180, 0]) sidescrew_hole();
             }
             
         
             translate([0, 100+panel_border+top_border/2-3, 0]) rotate([0, 90, 0]) 
             if (rightside) {
-                translate([3, 3, -epsilon-panel_thick]) 
-                cylinder(r1=side_screw_shaft_diam/2, r2=side_screw_head_diam/2, h=side_screw_head_height);
+                translate([3, 3, 0]) sidescrew_hole();
             } else {
-                translate([3, 3, 2*epsilon-side_screw_head_height]) 
-                cylinder(r2=side_screw_shaft_diam/2, r1=side_screw_head_diam/2, h=side_screw_head_height);
+                translate([3, 3, -panel_thick+2*epsilon]) rotate([0, 180, 0]) sidescrew_hole();
             }
         if (rightside) {
              translate([-panel_thick-2*epsilon, panel_height - 27, -20]) cube([2*panel_thick, 10, 5]);