diff --git a/monitor/modelo.py b/monitor/modelo.py
index 8af635b..a55c061 100644
--- a/monitor/modelo.py
+++ b/monitor/modelo.py
@@ -28,6 +28,11 @@ display_top_margin = (length - display_l) / 2
 display_bottom_margin = display_top_margin  # Symmetrical
 
 
+# Threaded insert hole dimensions
+ti_width = 3
+ti_depth = 3.5
+
+
 screen_cutout = (
     cq.Sketch().trapezoid(screen_w, screen_l, 90, mode="a").reset().vertices().fillet(1)
 )
@@ -54,7 +59,7 @@ 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")
+threaded_inserts = cq.Sketch().rarray(width / 6, 0, 4, 1).circle(ti_width, mode="a")
 
 # Holder for the screen (other half of the case)
 screen_base = (
@@ -88,11 +93,11 @@ screen_base = (
     .faces("<Z")
     .workplane(centerOption="CenterOfBoundBox")
     .placeSketch(back_reinforcement)
-    .extrude(1.5)
+    .extrude(1 + ti_depth - shell_t)
     .faces("<Z")
     .workplane(centerOption="CenterOfBoundBox")
     .placeSketch(threaded_inserts)
-    .cutBlind(-3)
+    .cutBlind(-ti_depth)
 )
 
 exporters.export(screen_base, "screen_base.stl")