diff --git a/monitor/modelo.py b/monitor/modelo.py
index 1148e01..9f1084b 100644
--- a/monitor/modelo.py
+++ b/monitor/modelo.py
@@ -29,18 +29,37 @@ display_bottom_margin = display_top_margin  # Symmetrical
 
 
 screen_cutout = (
-    cq.Sketch().trapezoid(screen_w, screen_l, 90, mode="a")
-    .reset().vertices().fillet(1)
+    cq.Sketch().trapezoid(screen_w, screen_l, 90, mode="a").reset().vertices().fillet(1)
 )
 
 segment_breaks_top = (
-    cq.Sketch().rarray(width/3,length,2,1)
-    .trapezoid(5, 15, 110, mode="a").reset().vertices().fillet(2)
+    cq.Sketch()
+    .rarray(width / 3, length, 2, 1)
+    .trapezoid(5, 15, 110, mode="a")
+    .reset()
+    .vertices()
+    .fillet(2)
 )
 
 segment_breaks_bottom = (
-    cq.Sketch().rarray(width/3,length,2,1)
-    .trapezoid(15, 15, 70, mode="a").reset().vertices().fillet(2)
+    cq.Sketch()
+    .rarray(width / 3, length, 2, 1)
+    .trapezoid(15, 15, 70, mode="a")
+    .reset()
+    .vertices()
+    .fillet(2)
+)
+
+back_reinforcement = (
+    cq.Sketch()
+    .trapezoid(width *2/3, 15, 90, mode="a")
+    .reset().vertices().fillet(2)
+)
+
+threaded_inserts = (
+    cq.Sketch()
+    .rarray(width/6,0,4,1)
+    .circle(2.5, mode="a")
 )
 
 # Holder for the screen (other half of the case)
@@ -54,7 +73,8 @@ screen_base = (
     .extrude(length)
     .faces("<X")
     .shell(-shell_t)
-    .edges("|X").fillet(fillet_s)
+    .edges("|X")
+    .fillet(fillet_s)
     # Cutout visible screen area from top face
     .faces(">Z")
     .workplane(centerOption="CenterOfBoundBox")
@@ -64,12 +84,21 @@ screen_base = (
     # Cutout for segment breaks
     .faces(">Z")
     .workplane(centerOption="CenterOfBoundBox")
-    .center(0, length/2)
+    .center(0, length / 2)
     .placeSketch(segment_breaks_top)
     .cutBlind(-1000)
     .center(0, -length)
     .placeSketch(segment_breaks_bottom)
     .cutBlind(-1000)
+    # Back reinforcement with holes for threaded inserts
+    .faces("<Z")
+    .workplane(centerOption="CenterOfBoundBox")
+    .placeSketch(back_reinforcement)
+    .extrude(1.5)
+    .faces("<Z")
+    .workplane(centerOption="CenterOfBoundBox")
+    .placeSketch(threaded_inserts)
+    .cutBlind(-3)
 )
 
 exporters.export(screen_base, "screen_base.stl")